Rudy Giuliani on Saturday threatened to take 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 to court if he attempts to issue a subpoena against President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE.

"If Mueller tries to subpoena us, we're going to court," Giuliani said in an interview with ABC News. Giuliani, a former New York City mayor, joined Trump's legal team in April.

Giuliani’s warning arrived just hours after The New York Times revealed that Trump's lawyers sent Mueller a 20-page letter in January arguing that Trump couldn’t obstruct justice because he has unfettered authority over all federal investigations.

The confidential letter obtained by the Times argues that the Constitution gives the president the broad authority to, "if he wished, terminate the inquiry, or even exercise his power to pardon."

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Though the letter predates Giuliani’s involvement with Trump’s legal team, Giuliani verified its contents to ABC News, adding that the legal strategy the letter outlines still stands.

The Times was the first to report on the existence of the letter, although the president appeared to foreshadow the newspaper's scoop minutes before it was published on Saturday. Trump questioned whether Mueller's office or the Justice Department had leaked his legal team's letter to the media.

"There was No Collusion with Russia (except by the Democrats)," Trump tweeted shortly before the Times story was published.

"When will this very expensive Witch Hunt Hoax ever end? So bad for our Country. Is the Special Counsel/Justice Department leaking my lawyers letters to the Fake News Media? Should be looking at Dems corruption instead?"

There was No Collusion with Russia (except by the Democrats). When will this very expensive Witch Hunt Hoax ever end? So bad for our Country. Is the Special Counsel/Justice Department leaking my lawyers letters to the Fake News Media? Should be looking at Dems corruption instead? — Donald J. Trump (@realDonaldTrump) June 2, 2018