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 attorney 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 on Tuesday told Congress he won't comply with a congressional subpoena for his documents and communications.

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"Mr. Giuliani will not participate because this appears to be an unconstitutional, baseless, and illegitimate 'impeachment inquiry,'" wrote Giuliani's attorney, Jon Sale, in a letter to legal counsel for the House Intelligence Committee.

Read the letter from Giuliani's attorney below.