U.S. President Donald Trump smiles as Juan Manuel Santos, Colombia's president, left, speaks during a news conference in the East Room of the White House in Washington, D.C., U.S., on Thursday, May 18, 2017. As Colombia's five-decade conflict with Marxist rebels winds down, Santos is battling to keep Washington's interest in the country that receives the greatest amount of U.S. aid in the Americas. Photographer: Andrew Harrer/Bloomberg via Getty Images
