WASHINGTON — The Latest on former President Donald Trump’s second Senate impeachment trial (all times local):

1 p.m.

Donald Trump’s historic second impeachment trial has 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 Jan. 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.

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 Jan. 13, a week before Democrat Joe Biden was inaugurated.

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HERE’S WHAT YOU NEED TO KNOW ABOUT FORMER PRESIDENT DONALD TRUMP’S SECOND SENATE IMPEACHMENT TRIAL:

Donald Trump’s second impeachment trial is starting, an undertaking like no other in U.S. history. The defeated former president stands charged by the House with inciting the deadly mob attack on the Capitol to overturn the election in what prosecutors argue is the “most grievous constitutional crime.”

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