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 accused media outlets of "going after" him and said that 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 is "protected and immune."

"WP, NBC, and CNN are going after me because I’m the messenger, and covering up the message, Dem corruption," he tweeted Tuesday, apparently referring to The Washington Post.

"Meanwhile, they have yet to ask Biden difficult questions because he is protected and immune like the Clintons and crooked Clinton Foundation!" he added.

WP, NBC, and CNN are going after me because I’m the messenger, and covering up the message, Dem corruption. Meanwhile, they have yet to ask Biden difficult questions because he is protected and immune like the Clintons and crooked Clinton Foundation! — Rudy Giuliani (@RudyGiuliani) October 1, 2019

Giuliani has faced scrutiny in recent days amid allegations that he tried to push Ukrainian officials to look into Biden or Biden's son to help Trump's 2020 reelection bid. He received a subpoena for documents relating to the matter on Monday.

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A recently released whistleblower complaint accused Trump of pushing Ukrainian President Volodymyr Zelensky to look into Biden, a Democratic presidential candidate, for his own gain. The complaint alleged that two State Department officials spoke to Giuliani "in an attempt to 'contain the damage' to U.S. national security" over his communication with Ukraine. Giuliani has denied the complaint's accusations.

A memo on Trump's call with Zelensky released by The White House said that Trump told the foreign leader he would have Giuliani talk to him.

“I will have Mr. Giuliani give you a call and I am also going to have Attorney General Barr call and we will get to the bottom of it. I'm sure you will figure it out,” Trump said.

It was not clear whether Giuliani on Tuesday was lashing out at the news outlets regarding specific stories or interactions. The Post recently reported that the former New York City mayor would speak at a conference sponsored by the Russian government, which he later appeared to back out of.

He also clashed with CNN's Chris Cuomo Chris CuomoCNN's Don Lemon: 'Blow up the entire system' remark taken out of context CNN's Lemon: 'We're going to have to blow up the entire system' if Democrats win back White House, Senate Giuliani criticizes NYC leadership: 'They're killing this city' MORE during an interview last month in which Giuliani said he asked Ukraine to look into Biden seconds after denying it.