Sen. Christopher Coons (D-Del.) said Wednesday that Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellTrump 'no longer angry' at Romney because of Supreme Court stance On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline The Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power MORE (R-Ky.) is blocking a vote on a bill to protect 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 in order to shield President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE.

Asked on MSNBC's "Morning Joe" if he thought McConnell was taking this step to protect Trump, Coons replied, "Yes."

"If I were majority leader of the Senate I’d be gravely concerned that there is an imminent constitutional crisis," Coons said, referring to Trump's comments regarding Mueller's investigation into Russia's election interference.

"Instead he is going to come to the floor likely and block us today," he added. "I'm puzzled by why the majority leader continues to do the president’s bidding on this.”

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Coons is co-sponsoring a bill with Sens. Jeff Flake (R-Ariz.) and Cory Booker (D-N.J.) to protect the Mueller probe. The senators are expected to try and force a floor vote on the matter on Wednesday.

The bill would mandate that only a senior Justice Department official can fire Mueller or another special counsel and allow for a expedited court review of such a firing. It could require that a special counsel who was not fired "for good cause" be reinstated.

Coons noted that there are some Republican senators that have voiced "constitutional concerns about this bill."

"I strongly disagree," he said. "I wouldn’t be sponsoring a bill that I thought had any constitutional infirmities."

He added that he's "struck by the fact" that the chairman of the Senate Judiciary Committee, Sen. Chuck Grassley Charles (Chuck) Ernest GrassleyGOP lawmakers distance themselves from Trump comments on transfer of power The Hill's 12:30 Report: Ginsburg lies in repose Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy MORE (R-Iowa), and several other leaders in the Republican caucus voted for the bill in the committee.

But McConnell has consistently opposed bringing the measure for a floor vote. He said earlier this month that legislation protecting the special counsel wasn't necessary because the Mueller investigation was "not under threat."

“I think, frankly, at the end of the day, McConnell has gotten reassurances from the president that he won’t act against Mueller, but those assurances are undermined every single day," Coons said.

Senate Majority Whip John Cornyn John CornynQuinnipiac polls show Trump leading Biden in Texas, deadlocked race in Ohio The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight MORE (R-Texas) said Tuesday that GOP lawmakers were exploring a way to have a vote on the bill due to pressure Flake has put on the GOP over judicial nominations.

Coons has told reporters that he is "confident" the bill would receive the 60 votes needed for it to pass.