President Donald Trump's attorney Rudy Giuliani said he wouldn't rule out the possibility of Trump taking the Fifth Amendment to avoid testifying in the Russia investigation.

The Fifth Amendment right is to protect against self-incrimination in court.

Giuliani's appearance on ABC on Sunday comes after a wild week of TV interviews, during which he revealed on-air that Trump knew about a $130,000 hush payment to an adult-film actress the president previously denied.

WASHINGTON (AP) — President Donald Trump's new attorney, Rudy Giuliani, won't rule out the possibility that the president would assert his Fifth Amendment right against self-incrimination in the swirling Russia investigation.

"How could I ever be confident of that?" the former New York City mayor and US attorney said Sunday on ABC's "This Week." "I've got a client who wants to testify — he said it yesterday. And Jay [Sekulow] and I said to ourselves, 'My goodness, I hope we get the chance to tell him the risks that he's taking.' So he may testify."

Giuliani said despite Trump's openness to sit down with special counsel Robert Mueller, he would strongly advise Trump against it.

"I'm going to walk him into a prosecution for perjury like Martha Stewart?" Giuliani said. Stewart was convicted in 2004 of lying to investigators and obstruction in an insider trading case.

Giuliani suggested that Trump wouldn't necessarily comply with a subpoena from Mueller, but he wouldn't rule out the possibility of the president sitting for an interview with Mueller.

"He's the president of the United States," Giuliani said. "We can assert the same privileges other presidents have."

A subpoena fight would likely find its way to the Supreme Court, which has never firmly decided whether presidents can be compelled to speak under oath.

During Watergate, the court ruled that a president could be compelled to comply with a subpoena for tapes and documents. President Bill Clinton sat voluntarily with independent prosecutor Ken Starr after being issued a subpoena to discuss his relationship with former White House intern Monica Lewinsky, avoiding the constitutional question.

A rocky start to Giuliani's tenure as Trump's newest lawyer

Stormy Daniels appears on "Saturday Night Live" with Alec Baldwin May 5. SNL

Giuliani's latest interview comes after days of conflicting statements about the investigations into the president.

Giuliani, who was hired by Trump last month, said he's still learning the facts of the Mueller case and the details of Trump's knowledge of a $130,000 hush payment to adult-film actress Stormy Daniels, who has alleged a sexual tryst with Trump in 2006. The payment was made by Trump personal attorney Michael Cohen days before the 2016 election.

When asked last month aboard Air Force One if Trump knew about the payment to Stormy Daniels, the president said no.

But Giuliani revealed last week that Trump had reimbursed Cohen for that payment and other unspecified items.

Giuliani said he first made Trump aware of the payment shortly after joining the case but now says he doesn't know when Trump knew about it. Trump said Saturday that Giuliani needed to "get his facts straight" but insisted they weren't changing their story.

Kellyanne Conway said Sunday on CNN's "State of the Union" that Trump on Air Force One meant that he didn't know about the payment at the time it was made, not at the time the question was asked.

Daniels' lawyer Michael Avenatti said on "This Week" after Giuliani's interview that the president's lawyer's latest comments were "an absolute unmitigated disaster," accusing Trump's team of "making it up as they go along."

Cohen is facing a criminal investigation in New York, and FBI agents raided his home and office several weeks ago seeking records about the Daniels nondisclosure agreement. Cohen is no longer representing Trump, Giuliani said, saying it would "be a conflict right now."

Watch the full interview below: