Poland's new president, Karol Nawrocki, is set to visit the White House on Wednesday, looking to strengthen his relationship with President Donald Trump and make the case that the U.S. needs to maintain its strong military presence in his country. The visit to Washington is Nawrocki's first overseas trip since taking office last month. It comes after Trump took the unusual step of involving himself in the elections of a longtime ally, Poland, and endorsing Nawrocki, the nationalist Law and Justice party candidate. Now in office, Nawrocki, a former amateur boxer and historian, is hoping to deepen his relationship with Trump at a fraught moment for Warsaw.