As former President Donald Trump’s impeachment trial gets underway in the Senate, Biden will meet with Treasury Secretary Janet Yellen and business leaders Tuesday to discuss the need for his $1.9 trillion COVID-19 relief package. Biden’s meeting is set for 1:45 p.m.

At noon, Harris will take part in swearing-in ceremony for Denis McDonough, who was confirmed Monday, to head the Veterans Administration.

Meanwhile, Neera Tanden, Biden’s nominee for director of the Office of Management and Budget, faces confirmation hearings Tuesday before the Homeland Security and Governmental Affairs Committee.

White House Press Secretary Jen Psaki will hold a briefing at 12:45 p.m.

A member of Trump’s legal team, David Schoen, sent a letter to Senate leadership informing them that the team is no longer asking for a pause in proceedings to enable him to observe the Sabbath.

In the letter obtained by ABC News, Schoen said he'd made arrangements so that the trial can move forward on its previous schedule.

"Accordingly, based on adjustments that have been made on the President’s defense team, I am writing today to withdraw my request so that the proceedings can go forward as originally contemplated before I made my request," Schoen wrote in a letter to Senate. "I will not participate during the Sabbath; but the role I would have played will be fully covered to the satisfaction of the defense team."

Schoen will be replaced on Trump's legal team so that the trial can continue while he observes Shabbat.

The Senate had changed the impeachment trial schedule based on this request and was prepared to wrap up proceedings Friday evening and return Sunday afternoon.

-ABC News' Trish Turner

The impeachment trial for former President Donald Trump is set to begin Tuesday, after the Senate reconvenes at 1 p.m. and conducts its morning business.

The House impeachment managers will gather at 12:55 p.m. and once they process into the Senate chamber, the trial will begin with procedural housekeeping, including approval of the resolutions that choreograph the trial. There will then be four hours of arguments and then a vote over the constitutionality of the trial.

On Wednesday, the House impeachment managers must file all motions, except those related to witnesses by 9 a.m., and Trump's legal team must to respond to the House managers' motions by 11 a.m. The trial will resume at noon, with arguments and a vote for any motions made by either side. After that, opening arguments begin and the House impeachment managers have up to 16 hours over two days, though both sides are limited to eight hours of arguments each day.

On Thursday, the House impeachment managers will continue and finish oral arguments with the proceedings beginning at noon. Trump's legal team begin their opening arguments on Friday. The trial resume at noon, but they will be finished by 5 p.m. in observance of the Sabbath.

The trial will continue at 2 p.m. Sunday and Trump's legal team is expected to finish their arguments. After that, senators may ask questions in writing, though they cannot exceed four hours of questions in one day.

The trial picks back up at noon on Monday -- finishing any business from Sunday. There will then be two hours of debate and a vote on whether to call witnesses. If the Senate calls witnesses, they will take depositions. The House impeachment managers and Trump's legal team are then permitted to make a motion to admit evidence, provided that the other side has been given at least 48 hours' notice. After that, there will be one hour of arguments evenly divided between the sides and then a vote on the motion to include evidence.

The trial will end with four hours of closing arguments, evenly divided between the sides. The Senate will then vote on conviction. Two-thirds of the senators must be present and voting for a conviction.

-ABC News' Trish Turner

The Senate confirmed Denis McDonough to serve as the secretary of veterans affairs.

The confirmation was approved by a vote of 87-7. McDonough previously served in various positions in former President Barack Obama’s White House, including chief of staff.

-ABC News' Trish Turner and Allison Pecorin