Sen. Kelly Loeffler blasted Sen. Mitt Romney after he signaled a willingness to call witnesses in President Trump's Senate impeachment trial, tweeting that Romney "wants to appease the left."

"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 Georgia Republican tweeted Monday. "The circus is over. It's time to move on!"

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

Loeffler's comments came after Romney indicated support for Democratic calls to have former national security adviser John Bolton testify in the trial. Romney told reporters over the weekend, "I think it's very likely I'll be in favor of witnesses, but I haven't made a decision finally yet, and I won't until the testimony is completed."

Reports on Sunday revealed that Bolton's upcoming book claims that Trump threatened to withhold foreign aid to Ukraine unless the country promised to investigate former Vice President Joe Biden. The revelation sparked House impeachment managers to renew their calls for Bolton to testify before the Senate.

"Americans know that a fair trial must include both the documents and witnesses blocked by the president. That starts with Mr. Bolton," the managers said in a statement.

The president's impeachment team remained silent on the news during the second day of their oral arguments in the Senate.

“We deal with transcript evidence,” Trump’s top defense lawyer, Jay Sekulow, told senators. “We deal with publicly available information. We do not deal with speculation, allegations, that are not based on evidentiary standards at all.”