Former New Mexico Gov. Gary Johnson speaks to supporters and delegates at the National Libertarian Party Convention in Orlando, Fla., on Friday. The Libertarian Party nominated Johnson as its presidential candidate Sunday. John Raoux/AP hide caption

Scott Horsley
Delegates listen to speeches in the main hall at the National Libertarian Party Convention, Friday, May 27, 2016, in Orlando, Fla. John Raoux/AP hide caption
One month after the atomic bomb was dropped on Hiroshima, a correspondent stands amid ruins left by the explosion. The structure seen standing became the Hiroshima Peace Memorial, which President Obama will visit Friday. AP hide caption
President Obama delivers a speech to the Vietnamese people at the National Convention Center in Hanoi on Tuesday. Kham/AP hide caption
Warehouse employee Rejinaldo Rosales, 34, at work in Tracy, Calif. Brandon Bailey/AP hide caption
Millions To Be Eligible For Overtime Under New Obama Administration Rule
Hillary Clinton, then secretary of state, greets troops in Kabul, Afghanistan, in 2012. She logged nearly a million miles visiting 112 countries in that position. Brendan Smialowski/AP hide caption
4 Things To Know About Hillary Clinton's Approach To Foreign Policy
President Obama has delivered nearly two dozen commencement speeches during his time in office — including this one, at the University of California, Irvine, in 2014. Jim Watson/AFP/Getty Images hide caption