Romney, Collins, Murkowski only Senate GOP holdouts on Graham's impeachment resolution

Sen. Lindsey GrahamLindsey Olin GrahamGraham warned Pentagon chief about consequences of Africa policy: report Senate braces for fight over impeachment whistleblower testimony US defense chief says Taliban deal 'looks very promising' but not without risk MORE (R-S.C.) said on Friday that all but three GOP senators had signed onto his resolution condemning the House impeachment inquiry. 

GOP Sens. Susan CollinsSusan Margaret CollinsErnst endorses bipartisan Grassley-Wyden bill to lower drug prices Senate braces for fight over impeachment whistleblower testimony Toward 'Super Tuesday' — momentum, money and delegates MORE (Maine), Lisa MurkowskiLisa Ann MurkowskiDemocrats worried about Trump's growing strength The Hill's Morning Report — AG Barr, GOP senators try to rein Trump in Overnight Defense: Senate votes to rein in Trump war powers on Iran | Pentagon shifting .8B to border wall | US, Taliban negotiate seven-day 'reduction in violence' MORE (Alaska) and Mitt RomneyWillard (Mitt) Mitt RomneyOn The Trail: Democrats plan to hammer Trump on Social Security, Medicare Donald Trump: Unrepentant, on the attack and still playing the victim The Hill's Campaign Report: New challenges for 2020 Dems in Nevada, South Carolina MORE (Utah) have not yet signed onto the resolution, according to an updated list of co-sponsors shared by Graham the day after he introduced the measure. 

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A spokesperson for Collins didn't immediately respond to a request for comment about whether or not she would back the resolution.

A spokeswoman for Romney noted that he said on Thursday that he would look at the resolution. 

"I’d like to see a vote taken in the House to decide whether there is support for impeachment. I’d love to see a more open process," Romney said. 

Murkowski also told reporters on Thursday that she hadn't yet read the resolution, which formally opposes the impeachment inquiry and urges House Democrats to hold an official vote on it. 

The resolution also says the House should give President TrumpDonald John TrumpCensus Bureau spends millions on ad campaign to mitigate fears on excluded citizenship question Bloomberg campaign: Primary is two-way race with Sanders Democratic senator meets with Iranian foreign minister MORE "due process" including "the ability to confront his accusers" and that House Republicans should be able to subpoena their own witnesses. 

When Graham introduced the resolution, he had 39 co-sponsors, but that quickly ticked up to 44, with only nine Republicans not signed on as of Thursday afternoon: Romney, Collins, Murkowski and Sens. Cory GardnerCory Scott GardnerErnst endorses bipartisan Grassley-Wyden bill to lower drug prices Senate Democrats pressure Trump to drop ObamaCare lawsuit Impeachment fallout threatens to upend battle for Senate MORE (Colo.), Lamar AlexanderAndrew (Lamar) Lamar AlexanderDemocrats worried about Trump's growing strength The Hill's Morning Report — AG Barr, GOP senators try to rein Trump in Overnight Defense: Senate votes to rein in Trump war powers on Iran | Pentagon shifting .8B to border wall | US, Taliban negotiate seven-day 'reduction in violence' MORE (Tenn.), Mike EnziMichael (Mike) Bradley EnziLawmakers trade insults over Trump budget cuts Republicans scramble to avoid Medicare land mine McConnell will not bring budget resolution to the floor MORE (Wyo.), Dan SullivanDaniel Scott SullivanSwing votes steal spotlight in marathon Trump impeachment Q&A Live coverage: Senators enter second day of questions in impeachment trial The Hill's Campaign Report: Ten days to Iowa MORE (Alaska), Johnny IsaksonJohnny IsaksonProgressive group backs Senate candidates in Georgia, Iowa Overnight Health Care: Trump budget calls for cutting Medicaid, ACA by T | Trump proposes removing FDA authority over tobacco | Lawmakers frustrated by lack of emergency funds for coronavirus Anti-abortion group backs Loeffler's election campaign after opposing her Senate appointment MORE (Ga.) and Rob PortmanRobert (Rob) Jones PortmanGOP senators offering bill to cement business provision in Trump tax law Mnuchin defends Treasury regulations on GOP tax law Bipartisan lawmakers introduce bill to combat cyberattacks on state and local governments MORE (Ohio). 

Graham tweeted early Thursday evening that Portman and Sullivan had signed on as co-sponsors, while Alexander, Isakson, Gardner and Enzi were in the list of co-sponsors released by Graham on Friday.

Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellErnst endorses bipartisan Grassley-Wyden bill to lower drug prices Senate braces for fight over impeachment whistleblower testimony Trump declares war on hardworking Americans with new budget request MORE (R-Ky.), who supports the resolution, has not said if it will come up for a vote. If it did, it would currently fail to overcome a procedural hurdle that requires legislation get 60 votes in order to advance on the Senate floor. 

Republicans have fumed over the House impeachment inquiry, which has held near-daily closed-door depositions with current and former administration officials

Speaker Nancy PelosiNancy PelosiThe Hill's Morning Report - Sanders on the rise as Nevada debate looms Lawmakers push back at Trump's Pentagon funding grab for wall Malaysia says it will choose 5G partners based on own standards, not US recommendations MORE (D-Calif.) has said a formal vote for the inquiry isn't required. Republicans, however, want a vote because it would put swing-district Democrats on the record and give them more leverage to call their own witnesses. 

Neither Collins, who is up for reelection next year, nor Murkowski nor Romney has backed the House impeachment inquiry or removing Trump from office. 

But they've each refrained from taking a position, or chided colleagues who have already made a decision on impeachment. 

"I'll keep an open mind until and unless there is some kind of decision reached by the House. ... It's a purposeful effort on my part to stay unbiased, and to see the evidence as it's brought forward," Romney told reporters in Utah earlier this month.

Murkowski, speaking during a recent health care event in Alaska, said it was “troubling ... that even before there has been any considered review, that people have decided.” Meanwhile, Collins said it was "entirely inappropriate" for colleagues to have already "made up their minds." 

—Updated at 4:29 p.m.