Updated at 12:37 p.m. ET
National security adviser Robert O'Brien promised a "professional transition" with the incoming administration of President-elect Joe Biden, partly diverging from the mode in use by President Trump, who says he contests the election.
"If the Biden-Harris ticket is determined to be the winner — and, obviously, things look that way now — we'll have a very professional transition with the National Security Council, no doubt about it," O'Brien said.