Rudy Giuliani says he has dirt on former Vice President Joe Biden's family that he plans to release if he anything happens to him, as federal prosecutors investigate the former mayor for possible campaign finance violations and illegal lobbying.

Donald Trump's personal lawyer took to Twitter on Saturday to clarify his repeated remarks about having 'an insurance policy' should the president try to throw him 'under the bus' amid the Ukraine scandal.

Giuliani said the statement is 'sarcastic' and that it 'relates to the files in my safe about the Biden Family's 4 decade monetizing of his office'.

'If I disappear, it will appear immediately along with my RICO chart,' he added.

His reference to RICO - the Racketeer Influenced and Corrupt Organizations Act, the federal law aimed at prosecuting organized crime - could indicate that Giuliani still has information that has not been released publicly from his days as a US Attorney in the 80s.

In a second tweet, Giuliani wrote: 'The Mafia couldn't kill me so NO, I am not worried about the swamp press.'

Rudy Giuliani says he has dirt against Joe Biden's family that he plans to release if he finds himself in trouble as he sits under a microscope in the House impeachment inquiry

Giuliani took to Twitter Saturday to clarify his repeated statements about having 'an insurance policy' should the president try to throw him 'under the bus' over the Ukraine scandal

The president's personal lawyer said his insurance 'relates to the files in my safe' about former Vice President Joe Biden's 'four decade monetizing of his office'

The tweets came hours after Giuliani was asked about the implication that he has compromising information on Trump should their relationship ever flounder during an interview on Fox News.

While railing against 'fake news,' Giuliani warned Trump against abandoning him - even as the former mayor becomes more deeply embroiled in the Ukraine scandal.

'I see things like, 'he's going to throw me under the bus'. I say he isn't, but I have insurance,' Giuliani said with a shrug.

He did not specify what the 'insurance' entailed, but insisted he has a 'very, very good relationship' with Trump anyway.

'This is ridiculous. We are very good friends. He knows what I did was in order to defend him, not to dig up dirt on Biden,' he said.

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The tweets came hours after Giuliani was asked about the implication that he has compromising information on Trump should their relationship ever flounder during an interview on Fox News (pictured)

While railing against 'fake news,' Giuliani warned Trump against abandoning him, but insisted he has a 'very, very good relationship' with the president anyway

Prior to that, Giuliani dismissed suggestions he could be indicted as a result of the impeachment inquiry.

'How long have you known me?,' Giuliani asks the host.

'Do you think I'm afraid? Do you think I get afraid? I did the right thing. I represented my client in a very, very effective way.'

Giuliani warned that if the Mafia weren't able to kill him then the media wouldn't be able to either.

'I expected the moment I heard Biden's name, I told my colleagues they're going to try to kill me,' he said. 'Because they're going to kill the messenger. But damn it, the mafia couldn't kill me, your colleagues are not going to kill me.'

Giuliani is currently dealing with his own investigation federal investigations following claims that he possibly engaged in illegal lobbying and campaign finance violations.

Documents released late Friday showed that Giuliani was in contact with Secretary of State Mike Pompeo in the months before the US ambassador to Ukraine was abruptly recalled.

The State Department released the documents to the left-wing activist group American Oversight in response to a Freedom of Information Act lawsuit. They show that Pompeo talked with Giuliani on March 26 and March 29.

Each of the calls lasted about four minutes, and they came before and after Giuliani passed Pompeo a packet of information from his freelance investigation into Joe Biden and his son Hunter's dealings in Ukraine.

Austin Evers, executive director of American Oversight, claimed the documents reveal 'a clear paper trail from Rudy Giuliani to the Oval Office to Secretary Pompeo to facilitate Giuliani's smear campaign against a US ambassador.'

Documents released late Friday show Donald Trump´s personal lawyer Rudy Giuliani was in contact with Secretary of State Mike Pompeo in March

Ambassador Marie Yovanovitch (above) told House impeachment investigators she felt 'kneecapped' by a 'smear campaign' Giuliani led against her

Last week, former Ambassador Marie Yovanovitch told House impeachment investigators she felt 'kneecapped' by a 'smear campaign' Giuliani led against her.

She was withdrawn from her post in Ukraine in May.

The documents released Friday also include materials that appear to be the information packet that Giuliani handed off to the State Department.

The report includes Trump hotel stationery, and appears to summarize a January 23, 2019, phone interview that Giuliani had with Ukraine's former prosecutor general, Victor Shokin.

In the interview summary, Shokin claims he was removed from his position under pressure from then-Vice President Biden, after being warned by US diplomats to break off investigations into Burisma, the gas company where Biden's son Hunter sat on the board.

Biden has bragged openly of how he threatened to withhold loan guarantees to ensure Shokin was removed from office in early 2016.

The documents released Friday also include summary of an interview that Giuliani had with Ukraine's former prosecutor general, Victor Shokin (above)

Giuliani is seen with fixer Lev Parnas, who assisted with translation in the Shokin interview. Parnas is now under indictment on campaign finance charges

Giuliani has pursued the theory that Shokin was removed to end investigations into Burisma.

Biden supporters dismiss that claim as a conspiracy theory, saying that Biden put pressure on Ukraine to oust Shokin was because the prosecutor failed to tackle corruption.

The interview summary released on Friday says Giuliani and two business associates, Lev Parnas and Igor Fruman, were present.

Parnas and Fruman were arrested last month on a four-count indictment that includes charges of conspiracy, making false statements to the Federal Election Commission and falsification of records.

The men had key roles in Giuliani's efforts to launch a Ukrainian corruption investigation against Democratic presidential contender Joe Biden and his son Hunter.

A second memo appears to be a summary of an interview with Yuri Lutsenko, also a former prosecutor general of Ukraine, conducted in the presence of Giuliani, Parnas and Fruman.

Lutsenko is quoted saying that he believes Hunter Biden received millions of dollars in compensation from the Ukrainian oil company Burisma.