Sen. Chris Coons (D-DE) said Wednesday that Senate Majority Leader Mitch McConnell (R-KY) “continues to do the President’s bidding” by refusing to allow a vote on a bill to protect special counsel Robert Mueller’s probe.

Coons and several other senators have pushed hard to get their bill, which was approved by the Judiciary Committee with bipartisan support, to the floor of the Senate for a chamber-wide vote. McConnell, though, has said for months that there’s no need for the measure. On Tuesday, he said he would “probably would” block the bill from receiving a vote.

“I think, frankly, at the end of the day, Leader McConnell has gotten reassurances from the President that he won’t act against Mueller, but those assurances are undermined every single day,” Coons said on MSNBC. Asked if he thought McConnell was protecting Trump, Coons said “yes.”

He added: “I’m puzzled by why the majority leader continues to do the President’s bidding on this.”