Legislative activity will halt in the Senate this week as the hearings in Donald Trump's second impeachment trial begin. A historic trial, but one both sides are anxious to get over and done with. Experts explain why and discuss the precedent this might set for the future.

WASHINGTON (AP) — Former President Donald Trump's second impeachment trial begins on Tuesday, a solemn proceeding that will force lawmakers to relive the violent events of Jan. 6 as House Democrats prosecute their case for "incitement of insurrection."

The nine Democratic impeachment managers for the House, which impeached Trump last month, argue that he alone was responsible for inciting the mob of supporters who broke into the U.S. Capitol and interrupted the presidential electoral count.

Lawyers for Trump argue that the trial is unconstitutional and say the former president was exercising freedom of speech when he told his supporters to "fight like hell" to overturn his defeat. The arguments against conviction are expected to be persuasive with Senate Republicans, most of whom have signaled that they will vote to acquit.

The trial is expected to last into the weekend and possibly longer. It will begin midday Tuesday and could go late into some evenings.

Here are 9 Republicans to watch

Five Republican senators voted with Democrats two weeks ago not to dismiss the trial on constitutional grounds. Those senators so far appear the most likely to vote to convict Trump. But there are others to watch, too.

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What to watch as the trial kicks off

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These are the 9 House impeachment managers

Associated Press writers Lisa Mascaro and Eric Tucker contributed to this report.

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