Poland's main right-wing opposition party, Law and Justice (Prawo i Sprawiedliwość, known by its Polish acronym PiS), is facing a serious internal rupture after around 40 of its parliamentary deputies refused to sign a loyalty declaration to party leader Jarosław Kaczyński. The crisis was triggered by former Prime Minister Mateusz Morawiecki's creation of an internal grouping called "Development Plus," which Kaczyński condemned as a deliberate attempt to divide the party. When Kaczyński issued an ultimatum — leave the association or lose your party membership — the dissidents held firm. A three-hour emergency meeting failed to resolve the standoff, and the PiS party council is now set to vote on expelling the rebels.

The dispute goes beyond a simple personality clash. Kaczyński has chosen the hard-line conservative Przemysław Czarnek — a professor who spent years at the Catholic University of Lublin and is known for anti-EU rhetoric and opposition to Ukrainian accession — as the party's standard-bearer for the next legislative elections, expected in 2027. That decision sidelined Morawiecki, who served as Prime Minister from 2017 to 2023 and represents a more moderate wing of the party. Morawiecki argues that PiS needs different voices to appeal to different voters, including urban populations, drawing a pointed comparison to Marco Rubio's ability to work alongside Donald Trump despite past rivalry. Kaczyński, for his part, accuses Morawiecki of staging a split at the worst possible moment.

The fracture is rooted in a deeper crisis that has been building since 2023. That year PiS won the most seats in parliament but proved unable to form a coalition government, pushing the party into opposition. The presidency was subsequently won by Karol Nawrocki, a PiS-backed candidate who has never been a party member and has at times adopted positions even further to the right than Kaczyński himself. Meanwhile, multiple former PiS ministers — including ex-Justice Minister Zbigniew Ziobro, who faces 24 criminal charges — are under active prosecution, a cloud that has contributed to the party's radicalisation as it seeks to consolidate its base.

The stakes are high. PiS currently holds 188 seats in the Sejm, Poland's lower house of parliament, making it the largest single parliamentary group. Opinion polls suggest that a nationalist right-wing bloc — potentially including PiS and the two far-right Confederation parties — could win enough seats to return to power in 2027. However, a clean split that sends Morawiecki's supporters into a separate party could reduce those numbers significantly, potentially denying any right-wing grouping a governing majority. Morawiecki himself appears to welcome expulsion, calculating that the role of dissident martyr could attract voters and give a new party a strong launch.

The unfolding drama matters far beyond internal party politics. Poland is a country of nearly 38 million people and one of the European Union's largest member states, whose political direction has significant implications for EU cohesion, the ongoing war in Ukraine, and democratic norms across central Europe. Whether PiS holds together under Kaczyński's increasingly authoritarian party management, or breaks apart and potentially advantages more extreme nationalist forces, will shape the political landscape as Poland heads toward one of its most consequential elections in years.