Conservative Karol Nawrocki's victory in Poland's presidential runoff has set the country on a more nationalist course. It also casts doubt on the viability of Prime Minister Donald Tusk's centrist government after the defeat of his liberal ally. Nawrocki was supported by U.S. President Donald Trump. He won just over 50% of votes in a tight race against Warsaw Mayor Rafał Trzaskowski. Tusk now says he will ask parliament to hold a vote of confidence in his fragile coalition government. The election race revealed deep divisions in the country along the eastern flank of NATO and the European Union.

European Union leaders are grappling with how to respond to the United States as it appears determined to start a trade war or even seize part of their territory. The leaders met on Monday for a defense summit. Poland's prime minister, whose country currently holds the EU's rotating presidency, said it would "be a cruel paradox" if amid threats from Russia and China, the EU and U.S. find themselves in conflict. President Donald Trump has threatened to impose tariffs on EU imports and refused to rule out military force to take control of Greenland. The European Commission president warns that the EU "will respond firmly."