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 from being fired was blocked in the Senate on Wednesday.

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.) asked for consent to bring the legislation, which has stalled after being passed in the Judiciary Committee in April, to the Senate floor for a vote.

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.) blocked his request.

Under the Senate's rules, a senator can come to the Senate floor and ask for consent to get a vote or pass a bill. Any one senator can block their request.

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McConnell didn't explain his move from the floor but it came hours after he told reporters that he believed that Mueller should be able to finish his investigation and that he didn't believe the special counsel was in danger of being fired.

"There's been no indication ... that Mueller investigation will not be allowed to finish and it should be allowed to finish. We know how the president feels about the Mueller investigation but he's never said he wants to shut it down," McConnell told reporters during a press conference.

Flake, speaking after McConnell's objection, knocked 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 rhetoric on the Mueller probe, which is investigating Russia's election interference and potential collusion between the Trump campaign and Moscow.

"With the firing of the attorney general ... the president now has this investigation in his sights and we all know it," Flake said from the Senate floor.

He added that Trump had accused Mueller of a witch hunt "without basis or fact."

"How such an investigation can be the cause of controversy is beyond me. ...[And] presidents do not get to determine what gets investigated and what and who does not," Flake said.

Democrats, and some Republicans, have called for the legislation to be passed in the wake of Trump ousting Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE last week and replacing him with acting Attorney General Matthew Whitaker, Sessions's former chief of staff.

Flake indicated on Wednesday that he believed Whitaker should recuse himself and should not have been put in the role to begin with.

"Yes. Yes, well I think he shouldn't be in that position at all. To have oversight over the investigation, that's what seems unconstitutional," Flake said.

The Senate Judiciary Committee passed legislation that 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 DOJ 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.

"This would be an easy step to take. It is a bipartisan bill that has been ready for floor action for months," Coons said at a press conference with Flake after the floor drama. "[But] it's clear that there's an unwillingness to act."

Flake warned on Wednesday that he and Coons will come back to the Senate floor to again request that it get a vote and that he will oppose any judicial nominations until it does.

"I can't think of values held more dear than the independence of our judicial system and an electoral system free of malign influence, either foreign or domestic. When I think of the things that we hold most dear, those things are at the top of the list. It is our sworn oath to keep it that way," Flake said from the Senate floor.

This story was updated at 5:17 p.m.