The former first lady shared her thoughts on the president refusing to concede and implored him "to honor the electoral process."
President Trump has yet to concede, or invite President-elect Joe Biden to the White House.
President-elect Biden faces key staffing decisions in the days ahead.
With more than 70 million votes, the Democratic nominee has beaten a record set by Barack Obama in 2008.
"This is it," the 44th US president said in an Election Day video, imploring people to vote for Joe Biden.
The former president stumped for Joe Biden in Florida, which is anyone's game as the 2020 election draws to an end.
“We literally left the White House a pandemic playbook,” the former president said.
The president's complaint falls flat in light of the New York Times tax revelations.
The Arkansas senator blocked Barack Obama's pick in 2016 because he claimed to believe then that voters should first choose their next president.
The president egged on supporters and repeated his baseless claim that the former president "spied" on his campaign.