Kamala Harris, Biden’s running mate, is also expected to speak Friday, the campaign aide said.

The Trump campaign has launched a fusillade of legal challenges across the electoral map in the hope of preserving the president’s path to reelection. Trump has lambasted the integrity of the vote count as it has drifted away from him. Neither the presidet nor his GOP allies have offered evidence or proof of voter fraud on the scale that they have alleged.

Trump has refused to concede the contest, and on Thursday evening levied an array of false or unfounded accusations against the ongoing tally from the White House briefing room. He has no public events listed on his schedule for Friday.