Journalist Carl Bernstein on Sunday expressed doubts that President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE would sit down for an interview with special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE, citing the president’s “compulsive, continual lying.”

“I think many of us will believe it when we see him sit down with Mueller. Look, we have no reason to believe almost anything that [Trump] says. What is so extraordinary about him and his presidency is the incessant, compulsive, continual lying,” Bernstein said on CNN.

“We’ve never had a president who lies like this, certainly in the modern era. Even Nixon,” the Watergate reporter added.

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Bernstein’s comments come as speculation swirls over whether Trump will sit down for an interview with Mueller as part of the special counsel’s investigation into Russian meddling in the 2016 presidential election.

Trump has publicly said he’s willing to speak with Mueller under oath. However, his lawyers are urging the president not to sit down with Mueller, citing concerns he could be charged with lying to investigators during the interview.

Bernstein said Sunday that Trump’s consistent lying should concern Republicans. The former journalist said some Republican lawmakers appear to be “forming a bodyguard around the president” instead of protecting Mueller’s investigation.

Several Republican lawmakers have in recent weeks pointed to a GOP-crafted memo and texts between two FBI officials as evidence that the Justice Department and Mueller’s investigation are biased against Trump.

While some lawmakers on both sides of the aisle have expressed interest in passing legislation to protect Mueller from being fired, Republican leaders have said such a bill is unnecessary.