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WATCH: White House’s Psaki holds news briefing

White House press secretary Jen Psaki said Monday that President Joe Biden will be busy with the business of the presidency and won’t spend much time watching the televised proceedings of his predecessor’s impeachment trial.

Watch the briefing in the player above.

Donald Trump’s historic second impeachment trial opened in the Senate, with Democrats arguing that the former president should be convicted for inciting a violent mob of his supporters to attack the U.S. Capitol on January 6.

Tuesday is the first day of arguments in the trial, which is expected to last around a week or more. Senators, sitting at their desks and in other locations around the chamber, will listen to arguments from Trump’s lawyers that the trial is unconstitutional because Trump is no longer president. Democrats will dispute that claim, pointing to legal experts and historical precedent.

WATCH: Biden focuses on stimulus plan as Democrats gear up for Trump’s Senate trial

Each side has two hours to make its case on Tuesday, after which the Senate is expected to vote and reject the GOP efforts to dismiss the trial.

Opening arguments from the House Democrats start Wednesday, and Trump’s lawyers are expected to mount their defense starting on Friday.

Trump is the first former president to be tried after leaving office.

The House impeached Trump January 13, a week before Democrat Joe Biden was inaugurated.