Senate Judiciary Committee Chairman Chuck Grassley Charles (Chuck) Ernest GrassleyThe Hill's 12:30 Report: Ginsburg lies in repose Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy Read: Senate GOP's controversial Biden report MORE (R-Iowa) says that his panel wouldn't consider a Supreme Court nomination if a vacancy appeared in 2020, breaking from Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellFEC flags McConnell campaign over suspected accounting errors Poll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ky.).

"If I'm chairman they won't take it up," Grassley said when asked during an interview with Fox News's Martha MacCallum if the committee would consider a nomination in the last year of President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's current term.

"Because I pledged that in 2016," Grassley said. "That's a decision I made a long time ago."

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McConnell has said he may be open to confirming a nominee brought forward in the next presidential election year, though he noted that doing so would be highly unusual.

"We’ll see if there is a vacancy in 2020," McConnell said on Monday.

However, he added, "You have to go back to 1880 to find the last time a Senate controlled by a party different from the president filled a vacancy on the Supreme Court that was created in the middle of a presidential election year."

Critics have gone after Republicans for blocking the confirmation of Merrick Garland Merrick Brian GarlandPoll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' Chief justice honors Ginsburg: 'When she spoke, people listened' MORE in 2016, President Obama's final year in office.

Republicans at the time defended their decision to not hold hearings or a vote on Garland by citing the 2016 presidential race, arguing the winner of that election should instead get to fill the seat.

Grassley is not the only Republican on the Judiciary Committee who has said they would not consider a Supreme Court nominee in 2020.

“If an opening comes in the last year of President Trump’s term, and the primary process has started, we’ll wait until the next election," Sen. Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-S.C.) said last week.

Republicans have been celebrating the confirmation of Supreme Court Justice Brett Kavanaugh Brett Michael KavanaughHarris faces pivotal moment with Supreme Court battle Poll: 59 percent think president elected in November should name next Supreme Court justice Feinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight MORE, who was confirmed in a narrow 50-48 vote in the Senate on Saturday.