Legislation protecting special counsel Robert MuellerRobert (Bob) Swan MuellerTrump says he'll release financial records before election, knocks Dems' efforts House impeachment hearings: The witch hunt continues Speier says impeachment inquiry shows 'very strong case of bribery' by Trump MORE was blocked on Wednesday for a second time in the past month.

Sen. Jeff FlakeJeffrey (Jeff) Lane FlakeLindsey Graham basks in the impeachment spotlight Kelly, McSally virtually tied in Arizona Senate race: poll The Hill's 12:30 Report — Presented by Nareit — White House cheers Republicans for storming impeachment hearing MORE (R-Ariz.), joined by Sens. Christopher CoonsChristopher (Chris) Andrew CoonsSenate confirms eight Trump court picks in three days Lawmakers call for investigation into program meant to help student loan borrowers with disabilities Senators defend bipartisan bill on facial recognition as cities crack down MORE (D-Del.) and Cory BookerCory Anthony BookerSunday shows — Nadler: A jury would convict Trump in 'three minutes flat' Booker on Harris dropping out: 'Iowa voters should have the right to choose' Booker campaign rakes in million after Harris exits 2020 race MORE (D-N.J.), tried to get consent to schedule the long-stalled legislation for a vote. 

Flake questioned why his colleagues weren't "up in arms" after a string of tweets from President TrumpDonald John TrumpLawmakers prep ahead of impeachment hearing Democrats gear up for high-stakes Judiciary hearing Warren says she made almost M from legal work over past three decades MORE bashing Mueller's investigation into Russian interference in the 2016 presidential election.

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"With the president tweeting on a regular basis, a daily basis, that the special counsel is conflicted, that he is leading so-called 12 angry Democrats and demeaning and ridiculing him in every way, to be so sanguine about the chances of him being fired is folly for us," Flake said.

Trump in a tweet hours before Flake's request blasted Mueller's probe into Russian election interference and possible collusion between the president's campaign and Moscow as the "angry Mueller gang of Dems" and exclaimed that it is "our Joseph McCarthy era."

But GOP Sen. Mike LeeMichael (Mike) Shumway LeeHillicon Valley: Pelosi works to remove legal protections for tech companies from USMCA | Treasury sanctions Russian group over 0 million hack | Facebook sues Chinese individuals for ad fraud | Huawei takes legal action against FCC Senators defend bipartisan bill on facial recognition as cities crack down Trump's legal team huddles with Senate Republicans MORE (Utah) objected to voting on the legislation, arguing the bill had constitutional issues.

"As Justice Scalia explains, we cannot convert an office like this one ... without creating a de facto fourth branch of government fundamentally undermining the principles of the separation of powers that is so core to our liberty," Lee said.

Flake pledged that they would come back to the Senate floor to try to set up the bill for a vote again.

Under the upper chamber's rules, senators can go to the floor to request a vote or passage of any bill or nomination. But any one senator can block their requests. 

The floor drama comes after Senate Majority Whip John CornynJohn CornynTrump, GOP shift focus from alleged surveillance abuse to Durham Russia probe Hillicon Valley: FTC rules Cambridge Analytica engaged in 'deceptive practices' | NATO researchers warn social media failing to remove fake accounts | Sanders calls for breaking up Comcast, Verizon Bipartisan senators call on FERC to protect against Huawei threats MORE (R-Texas) said Republican leadership was measuring support for the bill to try resolve a standoff with Flake, who is voting against judicial nominees until the Mueller protection bill gets a vote. 

"We're whipping that to see where people are. I think the leader needs that information to decide how to manage all the competing demands on our time," Cornyn said when asked about discussions within the Republican caucus about the legislation.

But there is still fierce opposition to the bill within the GOP caucus, and Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellKey House and Senate health leaders reach deal to stop surprise medical bills Biden: 'No party should have too much power' Overnight Energy: Pelosi vows bold action to counter 'existential' climate threat | Trump jokes new light bulbs don't make him look as good | 'Forever chemicals' measure pulled from defense bill MORE (R-Ky.) called it a “solution in search of a problem” on Tuesday. 

The president has stepped up his Twitter attacks on Mueller's probe in recent days amid several new revelations, including the special counsel's charge that former Trump campaign chairman Paul ManafortPaul John ManafortGiuliani draws attention with latest trip to Ukraine GOP senators request interview with former DNC contractor to probe possible Ukraine ties GOP fantasies about Ukrainian election 'interference' blow up Trump's impeachment defense MORE had violated his plea agreement. 

New reports emerged on Tuesday that Manafort's attorney had been sharing information with attorneys for Trump on his former campaign aide's cooperation with the Mueller probe. 

Trump after the midterm elections forced Attorney General Jeff SessionsJefferson (Jeff) Beauregard SessionsThe shifting impeachment positions of Jonathan Turley Rosenstein, Sessions discussed firing Comey in late 2016 or early 2017: FBI notes Justice Dept releases another round of summaries from Mueller probe MORE to resign and named Matthew Whitaker, Sessions's chief of staff, as acting attorney general. Whitaker, who has criticized the Mueller probe, is now overseeing it in place of Deputy Attorney General Rod RosensteinRod RosensteinRosenstein, Sessions discussed firing Comey in late 2016 or early 2017: FBI notes Justice Dept releases another round of summaries from Mueller probe Judge rules former WH counsel McGahn must testify under subpoena MORE

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 department official could 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.

Updated at 12:59 p.m.