WASHINGTON (AP) — The articles of impeachment against President Donald Trump don’t move to the Senate by themselves.

They are escorted by specific political stars along a tightly choreographed path from the House through the Capitol rotunda to the Senate for trial. There waits more history, pageantry and tradition of a type that’s only been seen on television once, and not since the 1999 trial of President Bill Clinton.

Like Clinton, Trump is expected to be acquitted. But the nation has never seen Chief Justice John Roberts cross the street from the Supreme Court and preside over the Senate trial. Or witnessed four Democratic presidential candidates sitting in silence, without their phones, ahead of the Feb. 3 Iowa caucuses.

Also, Twitter was not a thing the last time this happened. It’s now the accused president’s favorite bullhorn to proclaim his innocence and his fury in real time.

What to watch Wednesday as the House transmits the impeachment articles to the Senate:

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AT ISSUE

Under Speaker Nancy Pelosi, the House voted Dec. 18 to impeach Trump on charges of abuse of power and obstruction of Congress stemming from his conduct toward Ukraine. Trump is the third president to be impeached in U.S. history. The others are Clinton and, in 1868, Andrew Johnson. President Richard Nixon resigned before the House could impeach him.

Pelosi delayed the transmission of the articles to the Senate, holding out for more specific terms of the trial.

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THE CROSSING

First, Pelosi names the House prosecutors who will make the case to senators that Trump abused his office by pressuring Ukraine to investigate the son of political rival Joe Biden, and then obstructing Congress’ search for what happened.

Gaming out the “managers” has been a hot avocation in the Capitol for months, and Pelosi has held the details close. But judging from the Clinton trial, the exposure is likely to boost the profiles of whomever she picks. Likely choices include the two chairmen who led the impeachment hearings, Intelligence’s Adam Schiff and Judiciary’s Jerrold Nadler.

Around lunchtime, she’ll speak on the floor and the House will vote to transmit the articles.

Later Wednesday, the whole prosecution team will line up behind House Sergeant-at-Arms Paul Irving and House Clerk Cheryl Johnson, who will be holding the articles in folders. The procession will walk, two by two, through National Statuary Hall, past Pelosi’s office, across the Rotunda and to the doors of the Senate.

Johnson then hands the articles to Secretary of the Senate Julie E. Adams.

The managers will return to the House until the Senate admits them.

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FURNITURE AND OATHS

The Senate then considers some mundane-sounding details, as well as some historic ones, according to the precedent of Clinton’s impeachment trial.

First, they’ll consider resolutions on such things as how to arrange the chamber to accommodate the prosecution and defense teams, and who can watch from the galleries. Then, according to a memo circulated among senators, comes a series of formalities, including the reception of the House managers.

By the end of the week, the managers are expected to exhibit the articles of impeachment. Roberts and the senators will take their oaths. And the senators will sign an oath book used since 1986 for presidential and judicial impeachment trials that has been stored at the National Archives.

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THE SENATE CONVENES AS A COURT

“Hear ye! Hear ye! Hear ye! All persons are commanded to keep silent, on pain of imprisonment, while the Senate of the United States is sitting for the trial of the articles of impeachment.”

So proclaimed James Ziglar, then the Senate sergeant-at-arms, at Clinton’s trial in 1999.

Senate rules say the trial then begins, and runs six days a week — not on Sunday — until it’s resolved. But senators could vote to change the schedule.

Arguments in Trump’s trial begin next Tuesday, according to Senate Majority Leader Mitch McConnell.

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NO DISMISSAL

Trump has said he wants a full trial with witnesses while also suggesting he’d favor a dismissal.

But it takes 51 of 100 senators to do almost anything during a trial, and even Republican senators have rejected the idea of a dismissal.

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WITNESSES?

The jury is out on whether the Senate calls witnesses, but it’s possible.

Former national security adviser John Bolton has agreed to testify if subpoenaed, and some Republicans have been meeting privately to guarantee that witnesses can be called. With a 53-seat Republican majority, four GOP senators would have to vote with all Democrats to cross the 51-vote threshold.

On this, watch GOP moderate Sens. Susan Collins of Maine, Mitt Romney of Utah, Lisa Murkowski of Alaska and Lamar Alexander of Tennessee.

Any plan for witnesses would likely involve depositions and testimony from people called by Republicans and Democrats.

Trump has said he wants the Senate to call Pelosi and Schiff, but that’s highly unlikely.

During the Clinton trial, former White House intern Monica Lewinsky was deposed privately but not called to testify. She and Clinton had had an extramarital relationship, they both said.

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THE FOUR

Senators are fond of talking and any politician wants to stay connected to constituents. So the impeachment trial rule against speaking or consulting their phones on the Senate floor has the potential to make all of them cranky.

None moreso, however, than the four Democratic senators forced to decamp from Iowa less than three weeks before the election’s leadoff caucuses. Look for Sens. Elizabeth Warren of Massachusetts, Bernie Sanders of Vermont, Amy Klobuchar of Minnesota and Michael Bennet of Colorado to send surrogates to Iowa or make short trips back and forth.

“I’ve told them this trial is your responsibility as senators and scheduling is not going to influence what we should do,” Senate Democratic leader Chuck Schumer told The Associated Press in an interview last month. He said none of them objected. “There are benefits of running as a senator,” Schumer added, “and there are liabilities.”

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NEW INFORMATION?

It won’t be a total rehash of the House proceedings that stretched through the fall. Bolton, who has firsthand knowledge of the president’s pressure campaign on Ukraine, did not tell his story to the House.

The Senate also can consider a new trove of documents released Tuesday night by House Democrats that could shed new light on Trump’s private lawyer’s work to pressure Ukraine into investigating Biden as the president held up military aid to the U.S. ally bordering Russia.