President Barack Obama (R) greets President elect Donald Trump at inauguration ceremonies swearing in Donald Trump as the 45th president of the United States on the West front of the U.S. Capitol in Washington, U.S., Jan. 20, 2017. REUTERS/Carlos Barria
FILE PHOTO - President Barack Obama greets President elect Donald Trump at inauguration ceremonies swearing in Donald Trump as the 45th president of the United States on the West front of the U.S. Capitol in Washington