The impeachment proceedings can be streamed online on several platforms, including the House clerk’s website, C-SPAN and YouTube. The New York Times will also provide video of the hearing with live analysis from reporters beginning at 9 a.m.

Those watching on television can find the proceedings broadcast in full on several networks, including CNN and PBS.

Democrats appear to have more than enough support to vote to impeach Mr. Trump. But the breakneck pace at which they have moved ahead with the vote has left some Republican lawmakers prevaricating and proposing alternate solutions, like a bipartisan measure to censure the president.

Several House Republicans, including Representatives John Katko of New York and Liz Cheney of Wyoming, the party’s No. 3 in the chamber, have said that they would join Democrats in support of impeachment. Several more who have not publicly discussed their stances are expected to do the same on Wednesday.

Still, the vast majority of Republicans are expected to vote against impeaching Mr. Trump. Top Republicans, like Representative Kevin McCarthy of California, the minority leader, has said he is personally opposed to impeachment but will not formally lobby members of the party against it.

But unlike the last impeachment, in which Republicans were united in their opposition, the debate on Wednesday may reveal simmering divisions in the party as lawmakers on both sides have privately seethed about the president’s conduct both before and after the riot at the Capitol. The debate should reveal how willing Republicans are to publicly state those views.

Should the House vote as expected to impeach Mr. Trump, attention will turn to the Senate, which could begin a trial as early as next week. While President-elect Joseph R. Biden Jr. has deferred to lawmakers handling the proceedings, he has expressed concern that the president’s trial could distract from his policy agenda in the earliest days of his presidency.

Exactly when the Senate may move to hold a trial remains unclear, but there is some agreement among legal scholars that impeachment could be completed even after Mr. Trump leaves office.


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