A veteran of conflicts in Iraq and Afghanistan, the retired four-star army general, 67, beat out the favorite for the job, former under-secretary of defense Michele Flournoy, amid pressure on Biden to nominate more minorities for positions in his cabinet.
Trump still refused to concede and vowed to continue to fight in court after General Services Administrator Emily Murphy gave the green light Monday for Biden to coordinate with federal agencies ahead of his Jan. 20 inauguration. But Trump did tweet that he was directing his team to cooperate on the transition.
The Republican Trump trails Biden in national opinion polls ahead of Tuesday's Election Day. But the race is seen as close in enough swing states that Trump could still piece together the 270 votes needed to prevail in the state-by-state Electoral College that determines the winner.