Sen. Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.) on Friday said President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE could cause a “constitutional crisis” with efforts to fire 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 a big deal because that effort or that thought about doing so would really plunge our country into a constitutional crisis,” Booker said in an interview on “CBS This Morning.”

“To fire the special prosecutor, especially after the fact pattern we’re seeing about the firing of the FBI director, really presents a problem for our nation as a whole to have an unaccountable president … actively undermining an ongoing investigation into his administration and his campaign, where a number of close allies and associates have already faced indictment,” Booker continued.

The New York Times reported Thursday that Trump attempted to fire Mueller last June, but backed off after White House counsel Don McGahn refused Trump’s order and threatened to quit.

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Trump reportedly said Mueller had conflicts of interest in his investigation of Russian interference in the 2016 election, including a dispute over fees at Trump’s National Golf Club in Virginia and Mueller’s previous employment at a law firm that represented Trump’s son-in-law Jared Kushner Jared Corey KushnerAbraham Accords: New hope for peace in Middle East Tenants in Kushner building file lawsuit alleging dangerous living conditions Trump hosts Israel, UAE, Bahrain for historic signing MORE, according to the Times.

Trump also reportedly considered removing deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE, the Justice Department's second-highest official, and appointing Associate Attorney General Rachel Brand to oversee Mueller's team of prosecutors, but that option also never materialized.

Congressional Democrats quickly seized on the report to accuse Trump of what they say is obstruction of justice, and Sen. Richard Blumenthal (D-Conn.) responded to the report by calling for the Senate to take up bills aimed at protecting Mueller from being fired.

The Times's report comes one day after Trump said he would be willing to be interviewed by Mueller.

Trump told reporters at the White House on Wednesday that he is "looking forward" to the opportunity to sit down with Mueller.

Trump also mocked critics who have accused him of obstructing the Russia probe by attacking the investigations and referring to them as a “witch hunt.”

“You fight back, oh, it’s obstruction,” Trump mockingly told reporters.