U.S. President Trump speaks at swearing-in ceremony for Defense Secretary Mattis at the Pentagon in Washington

U.S. President Trump speaks at swearing-in ceremony for Defense Secretary Mattis at the Pentagon in Washington

U.S. President Donald Trump listens to remarks by Defense Secretary James Mattis (R) after a swearing-in ceremony for Mattis at the Pentagon in Washington, U.S., January 27, 2017. Reuters/Carlos Barria

January 31, 2017 11:30 AM (UTC+8)