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 pressured 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 to help convince the Department of Justice (DOJ) to drop a criminal investigation against an Iranian-Turkish gold trader who was also a client of Trump's current 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, Bloomberg reports.

Tillerson refused Trump's 2017 request, saying it would be illegal to interfere with an ongoing investigation. He repeated his stance to then-chief of staff John Kelly John Francis KellyMORE in a hallway conversation in the White House.

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At the time, Reza Zarrab, the trader in question, was being prosecuted by a New York federal court on charges of evading U.S. sanctions against Iran’s nuclear program, according to Bloomberg. As a result, Zarrab hired Giuliani and former Attorney General Michael Mukasey.

Giuliani reportedly reached out to U.S. officials several times to resolve the situation outside of court.

The report comes amid growing scrutiny over the president's dealings with foreign leaders, especially in light of a recent whistleblower report that raised concerns over a phone call Trump held in which he pressed Ukraine's president to investigate 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 and his son. The scandal has also implicated Giuliani, whose own dealings in Ukraine have drawn the attention of lawmakers in recent weeks.

The report also comes shortly after Trump announced he was pulling U.S. troops out of northeastern Syria ahead of an expected Turkish offensive against Kurdish forces there. Turkish President Recep Tayyip Erdoğan announced on Wednesday that he had formally launched the invasion.

Zarrab's release was reportedly a high priority for Erdoğan until the trader decided to cooperate with New York prosecutors.

Tillerson has openly said that Trump asked him multiple times to do things that would break the law, according to Bloomberg.

Eventually, Zarrab pleaded guilty and reportedly testified against Mehmet Hakan Atilla, who was in charge of international banking at Halkbank, a state-owned Turkish bank.

Erdoğan, Zarrab said, knew and supported the laundering effort on behalf of Iran, according to the new outlet. The Turkish president has denied the allegations.

The White House, Kelly and Tillerson declined to comment to Bloomberg.