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 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 reportedly used a White House meeting with Trump and then-Secretary of State Rex Tillerson Rex Wayne TillersonGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Conspicuous by their absence from the Republican Convention MORE in 2017 to push for the U.S. to drop charges on Reza Zarrab, a client of his with ties to Turkey's government.

CNN reported Thursday that Giuliani pressed Trump and Tillerson to support a deal that would drop U.S. prosecution of Zarrab for allegedly violating U.S. sanctions on Iran in exchange for Turkey's release of Andrew Brunson, an American pastor detained in the country a year earlier amid a coup attempt.

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Tillerson reportedly informed others, including then-White House chief of staff John Kelly John Francis KellyMORE, of the idea after the meeting, which he said he could not support.

News of Giuliani's involvement comes just days after it was reported that Trump himself at one time pressured Tillerson to convince the Justice Department to drop the charges, to which Zarrab later pleaded guilty.

Zarrab has since said that Turkey's president, Recep Tayyip Erdoğan, was aware of an international money-funneling scheme that resulted in funds being laundered for Iran. The Turkish leader has denied this charge.

Giuliani reportedly pressed U.S. officials several times unsuccessfully for the charges to be dropped ahead of his client's guilty plea.

The reports come as Giuliani faces intense scrutiny for his work on behalf of Trump, which has allowed him to remain a private citizen while attempting to dig up dirt on Trump's enemies, including 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.

The former New York City mayor's work to discredit Biden, particularly his and Trump's efforts to spur a Ukrainian investigation into the Democratic front-runner, have become the center of an impeachment inquiry launched by the Democratic-controlled House of Representatives.