President-elect Joe Biden is assembling his inner circle of advisers and Cabinet officials, despite President Trump's continued dismissal of the validity of the election.

Within a week after gaining the electoral votes needed to win the presidency, Biden announced that adviser and lawyer Ron Klain would be his chief of staff. Klain is the first official to be formally named by Biden.

Joe Biden is filling his White House with longtime aides who served in key roles in his campaign and, in some cases, worked alongside the president-elect during the Obama administration.

The Biden transition team announced a series of staff moves Tuesday, including that adviser and confidant Mike Donilon will move to the White House as senior adviser to the president. Donilon drove much of the messaging on the campaign and had served as counselor to Biden when he was vice president.

President-elect Joe Biden will announce three key appointments to his incoming White House staff Tuesday.

Rep. Cedric Richmond (D-La.) will leave Congress to take on a senior adviser role in the Biden administration handling public engagement, while Biden campaign manager Jen O’Malley Dillon will serve as deputy chief of staff and longtime Biden confidant Steve Ricchetti will become a counselor to the president, people familiar with the matter said ahead of Tuesday’s announcement.