(ANSA-AFP) - WARSAW, MAY 15 - Poland's presidential election, whose first round is on Sunday, could provide a boost for the governing centrists of the NATO and EU member or continue their difficult cohabitation with a conservative president. Outgoing President Andrzej Duda, an ally of the main opposition party Law and Justice (PiS), has not been shy with using his veto since centrist Prime Minister Donald Tusk came to power in 2023. Under Tusk's administration the country of 38 million people has tightened its cooperation with the European Union and cemented its staunch support of neighbouring Ukraine in the face of Russia's aggression. With Duda winding down his second and final term in office, Tusk's Civic Coalition (KO) is hoping its candidate, pro-EU Warsaw mayor Rafal Trzaskowski, will win the presidential election. Trzaskowski is currently the front-runner, with around 32 percent of the vote in the latest opinion polls. Next up is nationalist historian Karol Nawrocki, backed by the PiS and Duda, who is polling at around 25 percent -- and who scored a White House visit with US President Donald Trump earlier this month. Polling in third is Slawomir Mentzen, the candidate of the far-right Confederation party, who has around 14 percent of the vote in opinion surveys. (ANSA-AFP).