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In this Jan. 8, 2020, photo, national security adviser Robert O'Brien, listens as President Donald Trump addresses the nation from the White House on the ballistic missile strike that Iran launched against Iraqi air bases housing U.S. troops in Washington. (AP Photo/Alex Brandon)

Iran standoff shines spotlight on new Trump security adviser

Jan. 11, 2020 2:15 PM EST

WASHINGTON (AP) — In a defining week for President Donald Trump on the world stage, national security adviser Robert O'Brien was a constant presence at the president's side as the U.S. edged to the brink of war with Iran and back again. The contrasts with O'Brien's predecessor along the way — in...