President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's personal lawyer Rudy Giuliani Rudy GiulianiThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting CIA found Putin 'probably directing' campaign against Biden: report Democrats fear Russia interference could spoil bid to retake Senate MORE said Tuesday that he would not testify before the House Intelligence Committee unless committee members voted to remove Rep. Adam Schiff Adam Bennett SchiffSchiff to subpoena top DHS official, alleges whistleblower deposition is being stonewalled Schiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power MORE (D-Calif.) from the panel's chairmanship.

In an interview with The Washington Post, the former mayor of New York City said he was taking the White House's position that Schiff's congressional committee was illegitimate. He added the Trump administration would soon release a formal statement concerning the Intelligence Committee.

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“I wouldn’t testify in front of that committee until there is a vote of Congress and he is removed,” Giuliani said, referring to Schiff. “Let them hold me in contempt. We’ll go to court. We’ll challenge the contempt.”

“The position I’m stating is now the position of the administration,” Giuliani continued.

Giuliani joins a growing list of White House and Trump administration officials who have refused to testify before Congress or have been blocked from doing so by the administration, including U.S. Ambassador to the European Union Gordon Sondland, who was blocked from testifying Tuesday.

Giuliani's comments are the latest attack by the administration on House Democrats' impeachment inquiry, which they argue is illegitimate.

Democrats allege Trump during a July phone call improperly pressured Ukrainian President Volodymyr Zelensky to launch an investigation into former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE, one of his potential 2020 rivals, and has continued to solicit foreign interference in the election.

Giuliani and Trump have denied those claims, arguing that the president is within his rights to investigate allegations of corruption by current and former federal officials such as Biden.

Schiff's office did not immediately return a request for comment from The Hill on Giuliani's comments.