President Barack Obama makes Thanksgiving Day phone calls from the Oval Office to U.S. troops stationed around the world, Nov. 24, 2016. The President’s Coast Guard military aide, LCDR Ginny Nadolny is at right.

President Barack Obama makes Thanksgiving Day phone calls from the Oval Office to U.S. troops stationed around the world, Nov. 24, 2016. The President's Coast Guard military aide, LCDR Ginny Nadolny is at right.

President Barack Obama makes Thanksgiving Day phone calls from the Oval Office to U.S. troops stationed around the world, Nov. 24, 2016. The President’s Coast Guard military aide, LCDR Ginny Nadolny is at right.

President Barack Obama makes Thanksgiving Day phone calls from the Oval Office to U.S. troops stationed around the world, Nov. 24, 2016. The President's Coast Guard military aide, LCDR Ginny Nadolny is at right.

First Lady Michelle Obama meets with Melania Trump for tea in the Yellow Oval Room of the White House, Nov. 10, 2016.

First Lady Michelle Obama meets with Melania Trump for tea in the Yellow Oval Room of the White House, Nov. 10, 2016.

President Barack Obama talks on the phone in the Oval Office with Secretary of State John Kerry regarding the situation in Turkey, July 15, 2016. Chief of Staff Denis McDonough and Avril Haines, Deputy National Security Advisor, listen.

President Barack Obama talks on the phone in the Oval Office with Secretary of State John Kerry regarding the situation in Turkey, July 15, 2016. Chief of Staff Denis McDonough and Avril Haines, Deputy National Security Advisor, listen.

President Barack Obama greets His Holiness the Dalai Lama at the entrance of the Map Room of the White House, June 15, 2016.

President Barack Obama greets His Holiness the Dalai Lama at the entrance of the Map Room of the White House, June 15, 2016.

President Barack Obama receives an update in the Oval Office from FBI Director James Comey and Homeland Security Advisor Lisa Monaco on the mass shooting in Orlando, Fla., June 12, 2016. Also attending the meeting were Chief of Staff Denis McDonough, National Security Advisor Susan E. Rice and Deputy National Security Advisor Ben Rhodes.

President Barack Obama receives an update in the Oval Office from FBI Director James Comey and Homeland Security Advisor Lisa Monaco on the mass shooting in Orlando, Fla., June 12, 2016. Also attending the meeting were Chief of Staff Denis McDonough, National Security Advisor Susan E. Rice and Deputy National Security Advisor Ben Rhodes.

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.