President Barack Obama and First Lady Michelle Obama host a Passover Seder dinner with friends and staff in the Old Family Dining Room of the White House, April 28, 2016.

President Barack Obama and First Lady Michelle Obama host a Passover Seder dinner with friends and staff in the Old Family Dining Room of the White House, April 28, 2016.

President Barack Obama takes questions from student reporters during College Reporter Day in the James S. Brady Press Briefing Room of the White House, April 28, 2016.

President Barack Obama takes questions from student reporters during College Reporter Day in the James S. Brady Press Briefing Room of the White House, April 28, 2016.

President Barack Obama delivers remarks to student reporters during College Reporter Day in the James S. Brady Press Briefing Room of the White House, April 28, 2016

President Barack Obama delivers remarks to student reporters during College Reporter Day in the James S. Brady Press Briefing Room of the White House, April 28, 2016

Press Secretary Josh Earnest answers questions, as President Barack Obama surprises College Reporter Day student reporters in the James S. Brady Press Briefing Room of the White House, April 28, 2016.

Press Secretary Josh Earnest answers questions, as President Barack Obama surprises College Reporter Day student reporters in the James S. Brady Press Briefing Room of the White House, April 28, 2016.

President Barack Obama talks with the Duke of Cambridge while the Duchess of Cambridge plays with Prince George; at left First Lady Michelle Obama talks with Prince Harry of Wales, at Kensington Palace in London April 22, 2016.

President Barack Obama talks with the Duke of Cambridge while the Duchess of Cambridge plays with Prince George; at left First Lady Michelle Obama talks with Prince Harry of Wales, at Kensington Palace in London April 22, 2016.

President Barack Obama with First Lady Michelle Obama meets Prince George as the Duke and Duchess of Cambridge watch at Kensington Palace in London, April 22, 2016.

President Barack Obama with First Lady Michelle Obama meets Prince George as the Duke and Duchess of Cambridge watch at Kensington Palace in London, April 22, 2016.

President Barack Obama and National Security Advisor Susan E. Rice talk on the phone with Homeland Security Advisor Lisa Monaco to receive an update on a terrorist attack in Brussels, Belgium. The President made the call from the residence of the U.S. Chief of Mission in Havana, Cuba, March 22, 2016.

President Barack Obama and National Security Advisor Susan E. Rice talk on the phone with Homeland Security Advisor Lisa Monaco to receive an update on a terrorist attack in Brussels, Belgium. The President made the call from the residence of the U.S. Chief of Mission in Havana, Cuba, March 22, 2016.

President Barack Obama signs a letter to Ileana Yarza, a 76-year-old letter writer in Cuba, in the Oval Office, March 14, 2016.

President Barack Obama signs a letter to Ileana Yarza, a 76-year-old letter writer in Cuba, in the Oval Office, March 14, 2016.

President Barack Obama meets with Judge Merrick B. Garland in the Oval Office, March 9, 2016.

President Barack Obama meets with Judge Merrick B. Garland in the Oval Office, March 9, 2016.

President Barack Obama talks on the phone with NASA astronaut Commander Scott Kelly upon his return from a nearly yearlong mission on the International Space Station, in the Oval Office, March 2, 2016.

President Barack Obama talks on the phone with NASA astronaut Commander Scott Kelly upon his return from a nearly yearlong mission on the International Space Station, in the Oval Office, March 2, 2016.