Senate Minority Leader Charles Schumer Chuck SchumerPelosi: Trump Supreme Court pick 'threatens' Affordable Care Act Will Democrats attempt to pack the Supreme Court again? Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' MORE (D-N.Y.) said Tuesday he will ask for votes during the impeachment trial calling for witnesses to testify, including acting chief of staff Mick Mulvaney Mick MulvaneyOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security Blockchain trade group names Mick Mulvaney to board Mick Mulvaney to start hedge fund MORE and former national security adviser John Bolton John BoltonJudge appears skeptical of Bolton's defense of publishing book without White House approval Maximum pressure is keeping US troops in Iraq and Syria Woodward book trails Bolton, Mary Trump in first-week sales MORE.

"I am allowed to ask for votes. I will ask during the impeachment proceeding for a vote on whether Mulvaney should testify, and whether Bolton should testify," Schumer said during an interview with MSNBC.

Schumer predicted that Republicans would be "in a real dilemma" over the efforts by Democrats to get witnesses to testify. A motion to call a witness as part of the Senate trial would only take a simple majority, meaning Democrats need to win over four GOP senators to get to 51 votes.

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"Asking for witnesses, something so reasonable ... I expect we'll get a bunch of Republicans to vote with us on these requests," Schumer added.

Schumer has outlined four witnesses Democrats want to hear from as part of the impeachment trial against President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE, which is expected to start in January: Bolton, Mulvaney, Mulvaney's senior adviser Robert Blair and budget staffer Michael Duffey.

Schumer is also asking for one resolution that would be passed at the start of the trial that would determine both the procedure and any specific witnesses that would be called. During the Clinton trial, senators passed two resolutions: one, on the process, and a second calling specific witnesses.

GOP senators have indicated that they want to delay a decision on witnesses until after the trial has started, similar to the Clinton impeachment. Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellHawley warns Schumer to steer clear of Catholic-based criticisms of Barrett Senate GOP set to vote on Trump's Supreme Court pick before election Harris slams Trump's Supreme Court pick as an attempt to 'destroy the Affordable Care Act' MORE (R-Ky.) went a step further on Tuesday and said he doesn't want any witnesses during the trial.

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No GOP senator has backed Schumer's witness request so far.

Sen. Lisa Murkowski Lisa Ann MurkowskiSenate GOP set to vote on Trump's Supreme Court pick before election Supreme Court fight pushes Senate toward brink Democratic senator to party: 'A little message discipline wouldn't kill us' MORE (R-Alaska) told reporters on Tuesday that she hopes McConnell and Schumer come up with a deal, but sidestepped taking a position on witnesses.

"What has to happen is Senator McConnell and Senator Schumer need to figure out if they can come together with a proposal that we, the Senate, can move forward to support," Murkowski said.

Sen. Mitt Romney Willard (Mitt) Mitt RomneyCrenshaw looms large as Democrats look to flip Texas House seat The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election Trump dumbfounds GOP with latest unforced error MORE (R-Utah), viewed as another potential GOP swing vote, said he was "indifferent" on whether or not the Senate passes one resolution governing both process and witnesses, or handles them in separate resolutions.

"Leader McConnell apparently wants to do it in two parts," he added.