Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeHow fast population growth made Arizona a swing state Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden MORE (R-Ariz.) said on Wednesday that he will oppose any 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 judicial nominations until legislation protecting special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE gets a vote.

"I have informed the majority leader I will not vote to advance any of the 21 judicial nominees pending in the Judiciary Committee or vote to confirm the 32 judges awaiting confirmation on the Senate floor until ... [the bill] is brought to the full Senate for a vote," Flake said from the Senate floor.

Flake's threat will block the Judiciary Committee from approving judicial nominations and sending them to the full Senate without help from Democrats. Republicans hold a 11-10 majority on the panel and many of the most controversial nominees pass along party lines, meaning they would need either Flake's vote or a Democratic senator to flip.

ADVERTISEMENT

On the Senate floor, 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.) has slightly more leeway. With a 51-49 majority, Flake would need a Republican colleague to join him and every Democrat to block a judicial nominee on the Senate floor.

His decision comes after McConnell blocked Flake from bringing legislation to protect Mueller from being fired to a vote before the Senate.

The bill has been stalemated amid opposition from GOP leadership after it cleared the Judiciary Committee on a bipartisan basis.

The legislation would protect Mueller, or any other special counsel, in the event he is fired, but the bill has stalled amid opposition from GOP leadership.

The bill would codify Justice Department regulations that say only a senior department official can fire Mueller or another special counsel.

It would give a special counsel an "expedited review" of their firing. If a court determines that it wasn't for "good cause," the special counsel would be reinstated.