Sen. Kelly Loeffler Kelly LoefflerTrump supporters chant 'Fill that seat' at North Carolina rally Vulnerable GOP incumbents embrace filling Supreme Court seat this year Georgia GOP Senate candidates cite abortion in pushing Ginsburg replacement MORE (R-Ga.) on Monday lashed out at fellow GOP Sen. Mitt Romney Willard (Mitt) Mitt RomneyMomentum growing among Republicans for Supreme Court vote before Election Day Toobin: McConnell engaging in 'greatest act of hypocrisy in American political history' with Ginsburg replacement vote The Memo: Court battle explodes across tense election landscape MORE (Utah) over his apparent openness to call witnesses as part of President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE's impeachment trial.

Loeffler — who was just sworn into the Senate earlier this month after being appointed to succeed Sen. Johnny Isakson Johnny IsaksonGeorgia GOP Senate candidates cite abortion in pushing Ginsburg replacement Loeffler: Trump 'has every right' to fill Ginsburg vacancy before election Bottom line MORE (R-Ga.), who was popular among members on both sides of the aisle — tweeted that it was "time to move on" from the impeachment effort.

"Sadly, my colleague [Romney] wants to appease the left by calling witnesses who will slander the @realDonaldTrump during their 15 minutes of fame. The circus is over," Loeffler tweeted.

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After 2 weeks, it’s clear that Democrats have no case for impeachment. Sadly, my colleague @SenatorRomney wants to appease the left by calling witnesses who will slander the @realDonaldTrump during their 15 minutes of fame. The circus is over. It’s time to move on! #gapol — Senator Kelly Loeffler (@SenatorLoeffler) January 27, 2020

Officials for Romney didn't immediately respond to a request for comment.

Loeffler, in her tweet, didn't specify what comment from Romney had sparked the public call out of her colleague, but it comes after Romney reiterated his interest in hearing from former national security adviser John Bolton John BoltonDiplomacy with China is good for America The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep DOJ launches probe into Bolton book for possible classified information disclosures MORE on Monday, though he specified that he would make a final decision after opening arguments and questions from senators.

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“It’s pretty fair to say John Bolton has relevant testimony,” Romney said. "I think it's increasingly likely that other Republicans will join those of us who think we should hear from John Bolton."

Romney later clarified that his prediction was not based on conversations with senators. But his comments came the same day he spoke out about the need to hear testimony from Bolton in a lunch with Republican colleagues, a GOP aide confirmed to The Hill.

Romney isn't the only GOP senator who has indicated that he would be open to hearing from witnesses.

Sen. Lisa Murkowski Lisa Ann MurkowskiMomentum growing among Republicans for Supreme Court vote before Election Day Collins: President elected Nov. 3 should fill Supreme Court vacancy Barrett seen as a front-runner for Trump Supreme Court pick MORE (R-Alaska) said on Monday that she is "curious" what Bolton might say, but is waiting until after the initial phase of the trial to make a decision on witnesses.

Sen. Susan Collins Susan Margaret CollinsJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally Momentum growing among Republicans for Supreme Court vote before Election Day MORE (R-Maine) also said Bolton's allegations "strengthen the case" for witnesses, but she similarly will wait before she makes a decision.

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Loeffler and her husband donated to a pro-Romney super PAC in 2012, according to Open Secrets.

Loeffler is on the ballot in November for the rest of Isakson's term, which expires in 2022. Her appointment was met with a rocky reception by conservatives. Rep. Doug Collins Douglas (Doug) Allen CollinsVulnerable GOP incumbents embrace filling Supreme Court seat this year Georgia GOP Senate candidates cite abortion in pushing Ginsburg replacement Win by QAnon believer creates new headaches for House GOP MORE (R-Ga.) hasn't ruled out running against Loeffler.

An Atlanta Journal-Constitution poll released earlier this month found that more than 57 percent of Georgia voters didn't know enough about Loeffler to have a favorable or unfavorable opinion.

Of those who said they had an opinion, 30 percent of Republican voters said they have a favorable opinion, compared to nearly 10 percent who said they have an unfavorable opinion and nearly 60 percent of Republican voters who say they don't know enough to have an opinion.