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.

President Barack Obama and First Lady Michelle Obama greet 106-Year-Old Virginia McLaurin during a photo line in the Blue Room of the White House prior to a reception celebrating African American History Month, Feb. 18, 2016.

President Barack Obama and First Lady Michelle Obama greet 106-Year-Old Virginia McLaurin during a photo line in the Blue Room of the White House prior to a reception celebrating African American History Month, Feb. 18, 2016.

President Barack Obama watches First Lady Michelle Obama dance with 106-Year-Old Virginia McLaurin in the Blue Room of the White House prior to a reception celebrating African American History Month, Feb. 18, 2016.

President Barack Obama watches First Lady Michelle Obama dance with 106-Year-Old Virginia McLaurin in the Blue Room of the White House prior to a reception celebrating African American History Month, Feb. 18, 2016.

President Barack Obama watches First Lady Michelle Obama dance with 106-Year-Old Virginia McLaurin in the Blue Room of the White House prior to a reception celebrating African American History Month, Feb. 18, 2016.

President Barack Obama watches First Lady Michelle Obama dance with 106-Year-Old Virginia McLaurin in the Blue Room of the White House prior to a reception celebrating African American History Month, Feb. 18, 2016.

President Barack Obama drops by the Rural Council meeting in the Eisenhower Executive Office Building of the White House, Feb. 3, 2016. The President is flanked by Agriculture Secretary Tom Vilsack, left, and Health and Human Services Secretary Sylvia Mathews-Burwell at right.

President Barack Obama drops by the Rural Council meeting in the Eisenhower Executive Office Building of the White House, Feb. 3, 2016. The President is flanked by Agriculture Secretary Tom Vilsack, left, and Health and Human Services Secretary Sylvia Mathews-Burwell at right.

President Barack Obama and Vice President Joe Biden participate in a meeting with the White House Cancer Moonshot Task Force in the Vice President’s Ceremonial Office in the Eisenhower Executive Office Building of the White House, Feb. 1, 2016.

President Barack Obama and Vice President Joe Biden participate in a meeting with the White House Cancer Moonshot Task Force in the Vice President’s Ceremonial Office in the Eisenhower Executive Office Building of the White House, Feb. 1, 2016.

President Barack Obama convenes a meeting on the Zika virus, in the Situation Room of the White House, Jan. 26, 2016.

President Barack Obama convenes a meeting on the Zika virus, in the Situation Room of the White House, Jan. 26, 2016.

President Barack Obama convenes a meeting in the Situation Room to discuss the latest on the San Bernardino, Calif., shootings, Saturday, Dec. 5, 2015 .

President Barack Obama convenes a meeting in the Situation Room to discuss the latest on the San Bernardino, Calif., shootings, Saturday, Dec. 5, 2015 .