WASHINGTON, DC - JULY 20: U.S. President Barack Obama greets guest after speaking at the White House Summit on Global Development conference at the Ronald Reagan Building July 20, 2016 in Washington, DC. Officials say the summit is being held to assess progress on global development during Obama's presidency and to recommit to efforts at solving problems for the world's 1 billion people living in proverty worldwide. (Photo by Mark Wilson/Getty Images)