The 20-Day Presidential Clock
Under Article 136 of the Portuguese Constitution, the President of the Republic has 20 days from the date a law is sent to the Presidency to exercise one of three constitutional options: promulgate the law, return it to Parliament with a veto, or refer it to the Constitutional Court under Article 278 for a preventive constitutionality review. The revised Nationality Law passed parliament on April 1, 2026, and was transmitted to the Presidency the same day. The 20-day window therefore runs until approximately April 21, 2026.
President António José Seguro took office in February 2026, having been elected on a Socialist Party ticket. The PS voted 64 to 0 against the revised nationality law on April 1 — the same party that elected Seguro to the presidency. Unlike his predecessor Marcelo Rebelo de Sousa, who was affiliated with the governing centre-right PSD, Seguro has no natural alignment with the parliamentary majority that passed the law. His party has publicly called on him to refer the law to the Constitutional Court, citing concerns about retroactive application and the removal of transitional protections. As of April 5, 2026, no decision from President Seguro had been publicly announced.
The stakes of his decision are significant. The law — if it enters force — doubles the residency requirement for citizenship from 5 to 10 years for non-EU nationals, from 3 to 7 years for EU citizens and nationals of CPLP (Portuguese-speaking) countries, tightens the criminal conviction bar from 5 to 3 years, moves the start date for the residency clock from the application date to the date of first card issuance, removes automatic citizenship for children born in Portugal to foreign parents who lack 5 years of legal residency, and eliminates all transitional protections for applicants already mid-process. There is no grandfathering: a person with 4 years of legal residency who expected to apply for citizenship in 12 months would, under the new law, face an additional 6-year wait.
Option 1: Promulgation
If President Seguro decides to promulgate the law — that is, to sign it into force — it will be published in the Diário da República Eletrónico, Portugal's official electronic gazette. Publication triggers immediate legal effect: the law enters into force on the day after publication unless it contains a specific vacatio legis specifying a later start date. The revised nationality law does not include a built-in delay period, meaning it would enter force almost immediately upon publication, likely within days of promulgation.
Promulgation would be the fastest path to the law taking effect. If Seguro signs before April 21, the law could be published in the Diário da República as early as late April 2026 and operative by May 2026. All pending citizenship applications filed on or after the entry-into-force date — and, critically, all applications decided on or after that date regardless of when they were filed — would be assessed under the new rules. Because the law has no transitional provisions, no applicant in the current pipeline has a guaranteed exception. Promulgation by Seguro is considered the least likely outcome given his political alignment, but it remains constitutionally possible and would represent a decision not to challenge the parliamentary majority.
Option 2: Political Veto and Parliamentary Override
Under Article 136(1) of the Constitution, the President may return any non-organic law to Parliament within 20 days, accompanied by a message setting out his objections. The nationality law is an organic law (lei orgânica), which requires a two-thirds majority to pass and is subject to a slightly different veto procedure — but the President retains the power to send it back to Parliament within the same 20-day window. For an organic law, Parliament can override a presidential veto by an absolute majority of all 230 deputies, which means 116 votes.
The governing coalition of PSD and Chega, together with the support of CDS-PP and Liberal Initiative, controls approximately 160 seats. This is well above the 116-vote threshold for an override. A political veto by Seguro would therefore trigger a parliamentary override vote that the government would win, forcing the President to promulgate the law within eight days of Parliament's override resolution. The net effect of a veto followed by an override would be a brief delay of approximately two to four weeks compared to a direct promulgation. For this reason, a pure political veto without a Constitutional Court referral is considered an unlikely strategy for Seguro if his goal is to substantively prevent or delay the law from entering force.
Some constitutional law commentators have noted that a veto does not legally preclude the President from also filing a Constitutional Court referral. If Seguro returns the law with a veto and Parliament then overrides, Seguro would have eight days to promulgate following the override — but could, within that window, still file a referral under Article 278. This sequential use of both options would extend the total delay by several weeks and would be constitutionally legitimate, though practically complex and politically aggressive.
Option 3: Referral to the Constitutional Court
The most consequential option available to President Seguro — and the one that multiple legal experts and the PS have urged him to use — is a referral to the Constitutional Court under Article 278 of the Constitution for preventive constitutionality review. A referral suspends the law immediately: it cannot be promulgated, published, or enter into force while the review is pending. The Constitutional Court has 25 days from receipt of the referral to issue its ruling.
The basis for a Constitutional Court referral would most likely focus on the same categories of objection that led to the December 2025 ruling striking down four provisions of the first version of the law: namely, concerns about retroactive application of less favourable rules to individuals who had already begun a legal process in reliance on the existing rules, and questions about the proportionality of removing citizenship rights for children born in Portugal to foreign parents. The PS has already signalled that it intends to formally request that Seguro make the referral, citing these constitutional arguments. Whether Seguro agrees with the constitutional analysis — or whether he considers his role to be one of deference to the parliamentary majority on politically contested legislation — is the central uncertainty.
If the Constitutional Court clears the law after its 25-day review, Seguro would be obliged to promulgate it within eight days of the Court's ruling. If the Court strikes down provisions — as it did in December 2025 — Parliament would need to amend the affected provisions and re-vote before those sections could enter force. The government could choose to promulgate the remainder of the law while the struck-down provisions are revised and re-voted, which would mean a partial entry into force with some provisions deferred. This is the most complex scenario but not unprecedented in Portuguese constitutional practice.
What the Constitutional Court Struck Down in December 2025
To understand the basis for a potential new referral, it helps to understand what happened in December 2025. The Portuguese parliament had approved an earlier version of the nationality law in October 2025. President Marcelo Rebelo de Sousa referred it to the Constitutional Court in November 2025, citing concerns about constitutionality. On December 15, 2025, the Constitutional Court issued its ruling and declared four provisions unconstitutional.
The December 2025 ruling focused primarily on provisions that were found to apply less favourable rules retroactively to individuals who had already begun legal processes in reliance on the existing law. The Court found that the removal of transitional protections for applicants mid-process was constitutionally problematic under the principles of legal certainty and legitimate expectations (princípios da segurança jurídica e da proteção da confiança). The Court also found issues with provisions restricting citizenship for children born in Portugal who did not have a parent with sufficient years of legal residency, on grounds related to the protection of family life and the rights of children. Following the December ruling, Parliament revised the text, addressing some of the formal constitutional objections raised by the Court. However, critics — including the PS — argue that the revised law retained the substance of the problematic provisions by simply removing the formal transitional provisions entirely, rather than adding the protections the Court had found lacking. Whether this approach satisfies the Constitution is precisely the question that a new Court referral would resolve.
The government's position is that the revised text is constitutionally clean. The PS and other opposition parties disagree, and legal scholars have published analyses arguing both ways. President Seguro's legal advisors will make the assessment on which the President acts. The outcome of this analysis — and whether Seguro decides to test it in the Constitutional Court — is the question that tens of thousands of people in the citizenship pipeline are waiting to learn.
What Each Outcome Means for Citizenship Applicants
If President Seguro promulgates the law without a Constitutional Court referral, the new rules — including the 10-year residency requirement for non-EU nationals — will enter force by late April or early May 2026. There are no transitional protections. Every pending citizenship application decided after the law enters force will be assessed under the new rules, regardless of when it was filed or how many years of residency the applicant had accumulated under the old framework. Anyone who has been residing legally in Portugal for 4 years and expected to apply for citizenship after their 5th year will find that their anticipated timeline has changed to 10 years. The law also changes the start date of the residency clock from the date the residence permit application was lodged to the date the first residence card was actually issued — which typically adds 4 to 18 months to the effective wait depending on when the applicant's first card was issued.
If Seguro refers the law to the Constitutional Court, the existing citizenship rules remain in force during the review period. Applications filed and decided during the suspension — which could last between 25 and 60 days depending on the process — would be assessed under the current 5-year rule. If the Court clears the law after the review, those applications already submitted and pending a decision may have an argument for protection under legitimate expectations doctrine, though this will depend on case-specific legal analysis. If you have been residing legally in Portugal for 5 or more years and have not yet filed your citizenship application, filing immediately — before the law potentially enters force — is the most important action you can take to protect your existing rights under the current framework. The calculation of residency time for citizenship purposes is a separate technical question that your immigration lawyer should advise on given the clock-start change in the new law.
For CPLP nationals — particularly Brazilian nationals, who are the largest group of citizenship applicants in Portugal — the change from a 3-year to a 7-year residency requirement is the most significant impact. CPLP citizens who have been residing in Portugal for 3 or more years under the existing framework should urgently assess their eligibility under the current rules and, if eligible, file their citizenship application as quickly as possible. The changes to CPLP immigration rules in 2025 and 2026 are layered and require careful legal review for each individual's situation. A Golden Visa holder seeking citizenship through the investment residency route should also be aware that the applicable residency clock for citizenship purposes changes significantly under the new law; the current state of the Golden Visa programme in 2026 should be reviewed in light of the extended citizenship timeline.
Frequently Asked Questions
Can President Seguro refuse to sign the new Portuguese nationality law?
Yes. Under Article 136 of the Portuguese Constitution, the President has the power to return a law to Parliament within 20 days of receiving it, citing his reasons. This political veto can be overridden by an absolute majority of all 230 deputies (116 votes). The governing PSD-Chega coalition controls approximately 160 seats, well above the override threshold. A veto would therefore likely result in a parliamentary override and the law taking effect anyway, with a brief delay. For this reason, many legal analysts expect Seguro to prefer a Constitutional Court referral if he wishes to meaningfully challenge the law.
If President Seguro refers the nationality law to the Constitutional Court, what happens to my citizenship application?
A referral under Article 278 of the Constitution suspends the law immediately — it cannot enter into force while the review is pending. During the suspension, applications for Portuguese citizenship continue to be assessed under the existing rules: 5-year residency for non-EU nationals, 3-year residency for EU and CPLP nationals. If the Court strikes down provisions, Parliament must revise and re-vote before those provisions can enter force. If the Court clears the law, the President must then promulgate it, and it enters force at that point.
How long does the Constitutional Court review take?
The Constitutional Court has 25 days from receipt of the referral to issue a ruling on a preventive review under Article 278(8) of the Constitution. The previous ruling in December 2025 took approximately 22 days. If Seguro files a referral before April 21 and the Court takes its full 25 days, a ruling could come by approximately mid-May 2026.
If President Seguro promulgates the nationality law, when does it take effect?
Once promulgated, the law is published in the Diário da República Eletrónico and enters into force on the day after publication. The revised nationality law contains no vacatio legis (delayed entry into force). If promulgated before April 21, the law could be in effect by late April or May 2026. Because there are no transitional provisions, it applies immediately to all applications decided after that date.
If Parliament overrides a presidential veto, does the nationality law automatically pass?
Yes. Under Article 136(2) of the Portuguese Constitution, if Parliament overrides a presidential veto by an absolute majority of all deputies, the President is constitutionally obliged to promulgate the law within eight days. However, a veto does not legally preclude the President from also requesting a Constitutional Court review before the 8-day promulgation deadline — meaning Seguro could theoretically use both options sequentially.