Watch live: Senate to hold key vote on impeachment witnesses

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In a photo taken from the U.S. Senate live video feed, House manager and House Judiciary Committee Chairman Jerrold Nadler, D-N.Y., speaks on Day 10 of the impeachment trial of President Donald Trump. Senators could vote to acquit Trump on Friday. Screenshot via U.S. Senate | License Photo
Sen. Susan Collins, R-Maine, said she would vote in favor of allowing witnesses in the impeachment trial, while Sen. Lamar Alexander, R-Tenn., said he would not. UPI | License Photo
U.S. Rep. Mark Meadows, R-N.C., speaks to the media in the Senate subway at the U.S. Capitol on Thursday. Photo by Ken Cedeno/UPI | License Photo
The U.S. Capitol at sunset during impeachment trial on Thursday. Photo by Ken Cedeno/UPI | License Photo
Sen. Richard Blumenthal, D-Conn., speaks to the media on Thursday. Photo by Ken Cedeno/UPI | License Photo
Reporters take notes on their phones as they listen to Blumenthal. Photo by Ken Cedeno/UPI | License Photo
Sen. Rand Paul, R-Ky., submitted a question during Thursday's proceedings that named the whistle-blower, whose complaint sparked the impeachment investigation. Chief Justice John Roberts, who is presiding over the trial, refused to read it and Paul left the chamber. Photo by Alex Wroblewski/UPI | License Photo
Trump walks across the South Lawn to Marine One to depart for a trip to Harrison Charter Township, Mich., for a campaign rally on Wednesday. Photo by Ken Cedeno/UPI | License Photo
Sen. Ted Cruz, R-Texas, speaks to the members of the media in the Senate subway at the U.S. Capitol on Wednesday, where Trump's impeachment trial is underway. Photo by Ken Cedeno/UPI | License Photo
Sen. Minority Leader Chuck Schumer, D-N.Y., speaks to the media in the Senate subway. Photo by Ken Cedeno/UPI | License Photo
Schumer and House Democrats are leaning on the unique experience of Rep. Zoe Lofgren, D-Calif., who is the only member of Congress to have worked on all three modern impeachments. Photo by Ken Cedeno/UPI | License Photo
White House economic adviser Larry Kudlow prepares to speak in a television interview at the White House on Wednesday. Photo by Alex Wroblewski/UPI | License Photo
Lev Parnas, an associate of Trump's personal attorney Rudy Giuliani, speaks to the media outside U.S Capitol with his lawyer Joseph Bondy after attending the impeachment trial on Wednesday. Photo by Ken Cedeno/UPI | License Photo
Trump signs a United States-Mexico-Canada Trade Agreement on the South Lawn of the White House on Wednesday. Photo by Oliver Contreras/UPI | License Photo
Parnas (C) arrives for the link:impeachment trial: "https://www.upi.com/Top_News/US/2020/01/29/Watch-live-Senate-begins-questioning-phase-of-impeachment-trial/9221580300144/"} on Wednesday. Photo by Ken Cedeno/UPI | License Photo
Trump (L) delivers remarks with Israeli Prime Minister Benjamin Netanyahu in the East Room of the White House on Tuesday. Trump presented a vision for a two-state solution for Middle East peace, offering a path to Palestinian statehood and a mutual recognition of Israel as the nation-state of the Jewish people. Photo by Leigh Vogel/UPI | License Photo
Trump's 80-page plan includes a map detailing the future Palestinian state and has been agreed to by Netanyahu and Israeli opposition leader Benny Gantz. Palestinian leader Mahmoud Abbas opposes it. Photo by Leigh Vogel/UPI | License Photo
Sen. Mike Braun (L), R-Ind., speaks to the media alongside U.S. Sen. John Barrasso, R-Wyo., during a break from the sixth day of Trump's impeachment trial at the U.S. Capitol on Monday. Photo by Alex Wroblewski/UPI | License Photo
Sen. Tammy Baldwin (C), D-Wis., speaks to the media alongside Schumer (R) and Sen. Ben Cardin, D-Md., on Capitol Hill on Monday. Photo by Alex Wroblewski/UPI | License Photo
House impeachment manager Rep. Adam Schiff is joined by other Democratic managers while speaking to reporters. Witnesses are more likely to testify after a report about disclosures in former national security adviser John Bolton's upcoming book. Photo by Alex Wroblewski/UPI | License Photo
Trump greets Israeli Prime Minister Benjamin Netanyahu at the White House on Monday. Photo by Leigh Vogel/UPI | License Photo
Trump is expected to unveil a Middle East peace plan during Netanyahu's two-day visit. Photo by Leigh Vogel/UPI | License Photo
Trump shakes hands with Netanyahu in Oval Office. Photo by Michael Reynolds/UPI | License Photo
Sen. Rand Paul, R-Ky., speaks to reporters on Capitol Hill Thursday during the impeachment trial of President Donald Trump. Photo by Alex Wroblewski/UPI | License Photo
Supreme Court Chief Justice John Roberts presides over the Senate impeachment trial of President Donald Trump on Thursday. Image courtesy U.S. Senate/UPI | License Photo
Sen. Lisa Murkowski, R-Alaska, heads to the Senate floor Thursday after speaking to reporters on Capitol Hill. Photo by Alex Wroblewski/UPI | License Photo

Jan. 31 (UPI) -- President Donald Trump could be acquitted Friday in his Senate impeachment trial, now that adding witnesses and new evidence to the proceeding appears unlikely.

Republican leaders believe they have enough support to defeat Democratic proposals to include a few administration witnesses and new evidence. The Senate closed the questioning stage of the trial on Thursday and will next consider all motions.

This is the stage at which Democrats hoped to persuade at least four GOP senators to join them and vote to include key witnesses like former national security adviser John Bolton and and White House chief of staff Mick Mulvaney.

The chamber will vote on the motions later Friday after what's expected to be a several-hour floor fight. The vote will follow a round of closing arguments from both sides, beginning at 1 p.m. EST Friday.