Retiring Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden Maybe they just don't like cowboys: The president is successful, some just don't like his style MORE (R-Ariz.) said in a new interview that the Republican Party has been inured to the danger of President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's continued criticism of 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.

"It’s like the party is a frog slowly boiling in water, being conditioned to not be worried, to not think too hard about what’s happening around them,” Flake told The Washington Post.

“They feel at a loss about what to do because it’s the president’s party, without any doubt," he said. "So, there’s a lot of whistling by the graveyard these days.”

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Flake, who has been a longtime critic of Trump's, is in a standoff with other Senate Republicans over Trump's judicial nominees.

The Arizona Republican has refused to vote for any of them until the Senate votes on legislation that would protect Mueller, who is investigating alleged collusion between Trump's 2016 campaign and Russia.

The Senate Judiciary Committee has postponed votes on nearly two dozen judiciary nominees as Flake stands for the legislation he sponsored.

Flake has said he believes the bill has the votes to pass the Senate.

Rudy Giuliani, who is representing Trump in the Mueller probe, dismissed Flake's criticism in comments to the Post.

"He’s a bitter, bitter man,” Giuliani said of Flake. “It’s sick. Nobody likes him and they would like him gone.”