The Senate has reconvened for Trump's second impeachment trial which could wrap up as early as Saturday.

Senate Chaplain Barry Black first led the chamber in a prayer and invoked Capitol Police Officer Eugene Goodman by name in his prayer, speaking to bravery.

"Fill our senators with a spirit that combines common sense with commitment, conscience and courage," he said.

Presiding officer Sen. Patrick Leahy, D-Vt., then led the group through the Pledge of Allegiance, followed by the traditional "Hear ye! Hear ye! Hear ye!" proclamation from the sergeant-at-arms.

There will be an opportunity on Saturday to motion for witnesses, prompting two hours of debate -- potentially, kicking off a behind-closed-doors deposition process and extending the trial's timeline.

Democratic Sens. Sheldon Whitehouse, D-R.I. and Jeff Merkely, D-Ore., have expressed a willingness to entertain the idea, as has Republican Sen. Mitt Romney, despite leadership from both parties previously signaling wanting a speedy trial. The debate comes as new details emerge of a phone call between Trump and House Minority Speaker Kevin McCarthy.

But with Senate Minority Leader Mitch McConnell telling colleagues he will vote to acquit, it's all but certain Trump will not face conviction.

-ABC News' Trish Turner

Senate Minority Leader Mitch McConnell has told colleagues in an email he will vote to acquit Trump for "incitement of insurrection."

McConnell said, "While it was a close call" he believes impeachment is "primarily a tool of removal" and that the Senate now lacks jurisdiction with Trump out of office.

"The Constitution makes perfectly clear that Presidential misconduct while in office can be prosecuted after the President has left office, which in my view alleviates the otherwise troubling 'January exception' argument raised by the House," McConnell said in an email.

McConnell, on the Senate floor last month, criticized Trump for his behavior surrounding the attack on the Capitol.

"The mob was fed lies. They were provoked by the President and other powerful people, and they tried to use fear and violence to stop a specific proceeding of the first branch of the Federal Government which they did not like," McConnell said at the time.

-ABC News' Trish Turner

House impeachment managers and Trump's defense team on Saturday are expected to deliver closing arguments, for which they each have two hours, followed by a final vote on whether Trump is guilty of "incitement of insurrection" -- but an 11th-hour push for witnesses may shift the trial's timeline.

Among other motions that may be called Saturday, there will be an opportunity to motion for witnesses, prompting two hours of debate -- and potentially, kicking off a behind-closed-doors deposition process.

Democratic Sens. Sheldon Whitehouse, D-R.I. and Jeff Merkely, D-Ore., are two senators now expressing a willingness to entertain the idea, despite leadership from both parties previously signaling wanting a speedy trial. The debate comes as new details emerge of a phone call between Trump and House Minority Speaker Kevin McCarthy.

Rep. Jaime Herrera Beutler, R-Wash., one of ten House Republicans who voted to impeach Trump, in a statement overnight said that McCarthy spoke to Trump as violent protesters stormed the Capitol on Jan. 6, but the then-sitting president refused to stop them.

"To the patriots who were standing next to the former president as these conversations were happening, or even to the former vice president: if you have something to add here, now would be the time," she said in a statement.

The Senate will reconvene at 10 a.m.

-ABC News' Trish Turner

Rep. Jaime Herrera Beutler tweeted out a statement Friday reiterating comments she made about a talk she had with House Minority Leader Kevin McCarthy regarding former President Donald Trump's involvement in the Capitol siege.

The congresswoman from Washington's 3rd Congressional District is one of the 10 Republicans in the House voting for Trump's second impeachment. 

In the statement, Herrera Beutler reiterated her claims (which she made earlier to Washington newspaper The Daily News) that McCarthy spoke to Trump as violent protesters stormed the Capitol on Jan. 6, but the then-sitting president refused to stop them.

"When McCarthy finally reached the president on January 6 and asked him to publicly and forcefully call off the riot, the president initially repeated the falsehood that it was antifa that had breached the Capitol," she wrote. "McCarthy refuted that and told the president that these were Trump supporters. That's when, according to McCarthy, the president said: 'Well, Kevin, I guess these people are more upset about the election than you are.'"

Herrera Beutler said she's shared these details in conversation with various colleagues ever since she decided to vote for Trump's impeachment. 

She ended her statement by challenging those with firsthand knowledge of Trump's actions during the Capitol siege -- including former Vice President Mike Pence -- to come forward. 

"To the patriots who were standing next to the former president as these conversations were happening, or even to the former vice president: if you have something to add here, now would be the time," she wrote.

In addition to breaking down the Trump defense arguments one by one, House impeachment manager Rep. Joe Neguse, D-Colo., appealed to senators' sense of history in his final appeal for a vote to convict Trump. 

In a thinly veiled appeal to Senate Minority Leader Mitch McConnell, he quoted Kentucky Sen. Henry Clay -- McConnell's political idol and college thesis subject -- and referenced the vote of Sen. John Sherman Cooper -- McConnell's former boss who he interned for -- on the Civil Rights Act.

Noting his own parents' immigrant journey from East Africa, Neguse also noted McConnell's vote in 1986 to override President Ronald Reagan's veto of sanctions of South Africa during apartheid. McConnell was one of the few Republicans to buck Reagan on the vote.

"We remember those moments because they helped define and enshrine America at its best," Neguse said. "I believe that this body can rise to the occasion once again today. By convicting president trump and defending our republic."

"The cold, hard truth is that what happened on Jan. 6 can happen again," he said. "Senators, this cannot be the beginning. It can't be the new normal."

McConnell told colleagues in an email earlier in the day he would vote to acquit Trump.

-ABC News' Benjamin Siegel