President Trump on Saturday defended 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 as the former New York City mayor faces scrutiny from Congress and a reported investigation by federal prosecutors in New York.

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

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

So now they are after the legendary “crime buster” and greatest Mayor in the history of NYC, Rudy Giuliani. He may seem a little rough around the edges sometimes, but he is also a great guy and wonderful lawyer. Such a one sided Witch Hunt going on in USA. Deep State. Shameful! — Donald J. Trump (@realDonaldTrump) October 12, 2019

The New York Times reported Friday that federal prosecutors in Manhattan are looking into whether Giuliani's dealings with Ukraine violated U.S. lobbying laws.

One source told the newspaper that prosecutors are investigating Giuliani’s efforts to undermine Marie Yovanovitch, who served as the U.S. ambassador to Ukraine before being ousted earlier this year.

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The probe is reportedly tied to the case against two of Giuliani's associates, who were arrested this week and charged with alleged campaign finance violations.

House committees leading an investigation into President Trump over his own dealings with Ukraine subpoenaed Giuliani late last month.

Democratic lawmakers are seeking documents from Giuliani relating to efforts by Trump to push the Ukrainian government 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, a top 2020 Democratic presidential contender.