US President Barack Obama delivers the State of the Union address at the US Capitol in Washington on January 28, 2014. AFP PHOTO/Larry DOWNING/Pool (Photo credit should read LARRY DOWNING/AFP/Getty Images)
WASHINGTON, DC - SEPTEMBER 03: U.S. President Barack Obama waves to reporters after returning to the White House on board Marine One September 3, 2015 in Washington, DC. Obama spent three days in Alaska this week where he became the first sitting president to go to the Arctic Circle. (Photo by Chip Somodevilla/Getty Images)
President Barack Obama addresses American University's School of International Service in Washington, District of Columbia, U.S., on Wednesday, Aug. 5, 2015. The speech focused on the Iran nuclear deal being debated in Congress. American University was chosen as the venue by the White House because it is where President Kennedy made his famous 1963 speech on nuclear disarmament. President Obama's Iran Deal speech at AU falls on the 52nd anniversary of the signing of the Limited Nuclear Test Ban Treaty. Photographer: Pete Marovich/Bloomberg/Pool
US President Barack Obama delivers remarks after touring the Hannover Messe Trade Fair in Hanover, Germany, April 25, 2016. USA is partner country of the industrial fair Hannover Messe 2016 running from April 25 to April 29, 2016. / AFP / Jim Watson (Photo credit should read JIM WATSON/AFP/Getty Images)
WASHINGTON - JUNE 26: U.S. President Barack Obama comments on passage of the energy bill in the House of Representatives June 26, 2009 in the Reception Room of the White House in Washington, DC. The measure, which narrowly passed 219 to 212, would require the U.S. to cut pollution by 17 percent from 2005 levels by 2020 and by 80 in the next century through a cap-and-trade system of pollution allowances that can be bought and sold. (Photo by Dennis Brack-Pool/Getty Images)
