The five GOP senators who voted to call witnesses

Five Senate Republicans voted with Democrats to allow witnesses in former President TrumpDonald TrumpBaldwin calls Trump criticism following 'Rust' shooting 'surreal' Haley hits the stump in South Carolina Mary Trump files to dismiss Trump's lawsuit over NYT tax story MORE's impeachment trial, a curveball that has thrown the timeline for the proceedings into limbo.

In a surprise move, the Senate voted 55-45 on Saturday to allow debates and votes on calling specific witnesses after Rep. Jamie RaskinJamin (Jamie) Ben RaskinHouse progressives urge Garland to intervene in ex-environmental lawyer Steven Donziger's case Trump allies leaning on his executive privilege claims Oversight panel eyes excessive bail, jail overcrowding in New York City MORE (D-Md.), the lead impeachment manager, said that House Democrats wanted to call Rep. Jaime Herrera BeutlerJaime Lynn Herrera BeutlerAdams: Maternal health is in 'a crisis within a crisis' The Hill's Morning Report - Presented by Facebook - Biden talks up bright side beneath omicron's cloud Overnight Health Care — Presented by March of Dimes — Supreme Court weighs abortion restrictions MORE (R-Wash.).

Beutler has called for other people who have information on the Jan. 6 riot at the center of Trump's trial to come forward, including former Vice President Mike PenceMichael (Mike) Richard PenceHaley hits the stump in South Carolina Mitch McConnell's great Trumpian miscalculation Jan. 6 panel recommends contempt charges for Trump DOJ official MORE, who was in the Capitol during the mob attack. Members of the mob were recorded calling for Pence's hanging.

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The Washington Republican also said Trump during the attack told House Minority Leader Kevin McCarthyKevin McCarthyDemocratic caucus chairs call for Boebert committee assignment removal War of words escalates in House The Hill's Morning Report - Presented by Facebook - Biden talks up bright side beneath omicron's cloud MORE (R-Calif.) that the rioters were more concerned about the 2020 presidential election vote count than McCarthy was. Trump for weeks made baseless accusations that widespread voter fraud had cost him the election before Jan. 6, when lawmakers were evacuated during an Electoral College vote count. 

In the impeachment trial, the Senate is now trying to work out how to proceed, including if it can reach a deal on which specific witnesses to call. The decision to move forward at all with allowing witnesses is a surprise twist after senators in both parties said they expected the trial to wrap by Saturday afternoon.

Here are the five GOP senators who voted to allow witnesses:

Sen. Susan CollinsSusan Margaret CollinsReal relief from high gas prices The Hill's 12:30 Report: Biden to announce increased measures for omicron Collins says she supports legislation putting Roe v. Wade protections into law MORE (Maine)

Collins, a moderate reelected last year, was the first Republican to vote on Saturday to back the request for witnesses.

Collins is a swing vote who has been critical of Trump’s rhetoric on Jan. 6. She also broke with her party during Trump’s first impeachment trial to support an unsuccessful request for witnesses.

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Sen. Lindsey GrahamLindsey Olin GrahamGraham emerges as go-to ally for Biden's judicial picks This Thanksgiving, skip the political food fights and talk UFOs instead Biden move to tap oil reserves draws GOP pushback MORE (S.C.) 

Graham initially voted against allowing witnesses.

But after it became apparent the idea had the support of a majority of their chamber, he flipped his vote to yes.

Graham’s decision is likely tied to his threat that Trump’s impeachment team will try to call a laundry list of witnesses if Democrats opened the door to depositions.

“If you want a delay, it will be a long one with many, many witnesses,” he tweeted Saturday.

Sen. Lisa MurkowskiLisa Ann MurkowskiCongress should reject H.R. 1619's dangerous anywhere, any place casino precedent Democratic frustration growing over stagnating voting rights bills Graham emerges as go-to ally for Biden's judicial picks MORE (Alaska)

Murkowski, a moderate up for reelection next year, was the first GOP senator to call on Trump to resign.

Murkowski previously voted to acquit Trump during his 2020 trial and opposed additional witnesses, saying at the time: "I don’t believe the continuation of this process will change anything.”

Sen. Mitt RomneyWillard (Mitt) Mitt RomneyGOP anger with Fauci rises No deal in sight as Congress nears debt limit deadline GOP holds on Biden nominees set back gains for women in top positions MORE (Utah)

Romney was the only GOP Senator to support one of the articles of impeachment against Trump in 2020, and he has been one of Trump’s most consistent critics within the Senate Republican caucus.

Romney told reporters shortly before Saturday’s vote that he would support requests for witnesses.

“I will support additional witnesses if the counsel on either side wishes to call witnesses,” he said.

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Sen. Ben SasseBen SasseThe Hill's Morning Report - Presented by ExxonMobil - House to vote on Biden social spending bill after McCarthy delay CBO releases cost estimate of Biden plan Real conservatives must make a choice MORE (Neb.)

Sasse was the first GOP senator to say he was open to considering articles of impeachment from the House.

Sasse is considered a 2024 contender but has pushed back strongly against efforts by Trump and GOP Sens. Ted CruzRafael (Ted) Edward CruzCongress averts shutdown after vaccine mandate fight On The Money — Congress races to keep the lights on House sets up Senate shutdown showdown MORE (Texas) and Josh HawleyJoshua (Josh) David HawleyFacebook unblocks Rittenhouse searches GOP holds on Biden nominees set back gains for women in top positions Graham emerges as go-to ally for Biden's judicial picks MORE (Mo.), who also have White House ambitions, to overturn the 2020 election.

Sasse was one of six GOP senators who voted to find the trial constitutional.

--Updated on Feb. 14 at 12:22 p.m.