Legislation protecting special counsel Robert MuellerRobert (Bob) Swan 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 was blocked on Wednesday for a second time in the past month.

Sen. Jeff FlakeJeffrey (Jeff) Lane FlakeAppeals court refuses to throw out Joe Arpaio's guilty verdict after Trump pardon 70 former senators propose bipartisan caucus for incumbents McSally ties Democratic rival Kelly to Sanders in new ad MORE (R-Ariz.), joined by Sens. Christopher CoonsChristopher (Chris) Andrew CoonsTim Kaine endorses Joe Biden ahead of Super Tuesday Democratic senators ask DOJ watchdog to expand Giuliani probe Graham warned Pentagon chief about consequences of Africa policy: report MORE (D-Del.) and Cory BookerCory Anthony BookerThe Memo: Biden seeks revival in South Carolina Bloomberg campaign lobbied Yang for endorsement, possible VP offer: report Warren calls for changes to presidential pardon power, pledges to create clemency board 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 TrumpTrump endorses former White House physician Ronny Jackson for Congress Newly released emails reveal officials' panic over loss of credibility after Trump's Dorian claims Lindsey Graham thanks Trump, bemoans 'never-ending bull----' at South Carolina rally  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 LeeThe Hill's Campaign Report: Sanders top target at CPAC Trump upends controversial surveillance fight Former impeachment managers clash over surveillance bill 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 CornynGOP, Democrats hash out 2020 strategy at dueling retreats Congress eyes killing controversial surveillance program Hillicon Valley: Twitter falling short on pledge to verify primary candidates | Barr vows to make surveillance reforms after watchdog report | DHS cyber chief focused on 2020 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 McConnellThe Hill's Morning Report — Presented by Facebook — Washington, Wall Street on edge about coronavirus Overnight Energy: Murkowski, Manchin unveil major energy bill | Lawmakers grill EPA chief over push to slash agency's budget | GOP lawmaker accuses Trump officials of 'playing politics' over Yucca Mountain Lawmakers race to pass emergency coronavirus funding 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 ManafortNadler seeks interviews with DOJ prosecutors that left Stone case Stone judge under pressure over calls for new trial President Trump's assault on checks and balances: Five acts in four weeks 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 SessionsDOJ puts its integrity in doubt by interfering with immigration courts Trump shakes up Justice Department, intelligence community Do people think ill of Jeff Sessions merely based on the sound of his voice? 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 RosensteinAttorney General Barr is in a mess — and has no one to blame but himself Graham requests interviews with DOJ, FBI officials as part of probe into Russia investigation DOJ won't charge former FBI Deputy Director McCabe 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.