The Kentucky Republican — who voted to confirm Thomas to Supreme Court in 1991 and played a leading role in installing three conservative jurists to the court during President Donald Trump's tenure — rejected the concerns as a "coordinated effort to nullify" the justice's presence on the court.

"The left's quest to delegitimize the Supreme Court found its latest outlet," McConnell said on the Senate floor. "Washington Democrats are now trying to bully this exemplary judge of 30-plus years out of entire legal subjects, or off the court entirely."

On Thursday, The Washington Post and CBS News reported on 29 text messages exchanged between the former White House chief of staff Mark Meadows and Ginni Thomas, Clarence Thomas' wife and a longtime conservative activist, in which Ginni Thomas urged Meadows to pursue efforts to overturn the 2020 presidential-election results.

The texts are in the possession of the House select committee investigating the January 6, 2021, Capitol riot, and the panel is expected to request an interview with Ginni Thomas, CNN reported Monday. 

Since the news broke, more than two dozen Democratic lawmakers have demanded that Clarence Thomas recuse himself from cases concerning the insurrection, raising concerns about a conflict of interest. Prominent legal-ethics experts have also expressed concerns that Ginni Thomas' political activities present a conflict of interest for her husband. 

Democrats have scrutinized Clarence Thomas' decision not to recuse himself from a Supreme Court order handed down two months ago in which the court rejected Trump's bid to withhold White House records from the Capitol-riot committee as part of its investigation.

Thomas was the sole dissenter. He did not provide any reasoning for his decision, which is standard for such emergency motions that reach the high court. In addition to pushing for his recusal from insurrection-related cases, Democrats have urged Thomas to provide a written explanation for his dissent.

Democrats have also renewed calls for legislation that would establish an ethics code for Supreme Court justices. Under current law, justices decide when to recuse themselves from cases.

Some progressive lawmakers — including Rep. Alexandria Ocasio-Cortez of New York — have called for Thomas to resign or face impeachment, which McConnell broadly dismissed on Wednesday.

"Far-left House members are talking about dusting off their party's impeachment addiction for a third consecutive year," he said. "Make no mistake: This performative outrage is not in earnest. This is a political hit, part of liberals' years-long quest to delegitimize the court."

Ocasio-Cortez on Tuesday tweeted that Thomas' refusal to "recuse himself from matters involving his wife" required an investigation.

McConnell said Democrats had for years sought to "bully" conservative justices "based on spurious accusations about fake ethical problems or partiality." He called on Thomas to "ignore" the most recent criticism.  

"This new inappropriate pressure campaign is just a continuation of this well-worn pattern," he said. "It has no basis in Justice Thomas' decades of impeccable service on the bench. The justice and the entire court should feel free to ignore it."

McConnell also criticized Senate Majority Leader Chuck Schumer for his 2020 comments in which the Democratic lawmaker said Justices Neil Gorsuch and Brett Kavanaugh would "pay the price" if they tried to curtail abortion rights.

"In 2020, the Democratic leader himself stood on the steps of the Supreme Court and threatened multiple sitting justices by name if they didn't reach the policy outcome that liberals wanted," he said.