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 met with his personal 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 for lunch at his Virginia golf course on Saturday as the former New York City mayor faces scrutiny over his dealings with Ukraine, according to The New York Times.

The meeting came as Trump publicly voiced support for Giuliani in the wake of a report that federal prosecutors are investigating whether Giuliani violated lobbying laws with his efforts related to Ukraine.

Early Saturday morning, Trump tweeted, "So now they are after the legendary 'crime buster' and greatest Mayor in the history of NYC, Rudy Giuliani."

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"He may seem a little rough around the edges sometimes, but he is also a great guy and wonderful lawyer," the president added. "Such a one sided Witch Hunt going on in USA. Deep State. Shameful!"

Trump also spoke with Giuliani over the phone before their lunch, the Times reported, citing two unidentified sources. The White House did not immediately respond to a request for comment from The Hill.

Trump and Giuliani are facing mounting scrutiny over their efforts to pressure Ukraine into investigating 2020 presidential candidate 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 over unfounded allegations of corruption. A whistleblower complaint focused on their interactions with Ukraine is at the heart of House Democrats' formal impeachment inquiry.

The Times reported on Friday that prosecutors were looking into Giuliani's efforts to undercut Marie Yovanovitch, the former U.S. ambassador to Ukraine, who was recalled from her post in May as Trump looked to pressure Ukraine into investigating a top political opponent.

The probe is reportedly linked to a case against two of Giuliani's associates who were arrested last week. Two Ukraine-born businessmen, Lev Parnas and Igor Fruman, were arrested last week and charged with sending illegal contributions to a congressman they hoped would help remove Yovanovitch.

Giuliani has acknowledged working with Parnas and Fruman to find dirt on the Biden family. But he has dismissed allegations of wrongdoing.

He said Saturday on CNN that he has received no indications that his dealings in Ukraine are under federal investigation. Giuliani also questioned why the investigation had been leaked to the Times, saying that "if it's an appropriate law enforcement investigation, you try to keep it secret so the subjects aren't alerted."

"Nothing but leaks, which has to tell you, whether they are or are not investigating, it's a political attack. Otherwise, why leak it?" he asked.

Trump also confirmed Saturday evening that Giuliani remains a member of his legal team.