Former CIA Director John Brennan John Owen BrennanJournalism or partisanship? The media's mistakes of 2016 continue in 2020 Comey on Clinton tweet: 'I regret only being involved in the 2016 election' Ex-CIA Director Brennan questioned for 8 hours in Durham review of Russia probe MORE hit back at President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE for accusing the Obama administration of investigating his campaign in an effort to help Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE, saying it reveals Trump’s “paranoia” about 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’s investigation.

“This tweet is a great example of your paranoia, constant misrepresentation of the facts, and increased anxiety and panic (rightly so) about the Mueller investigation,” Brennan tweeted Monday.

“When will those in Congress and the 30 percent of Americans who still support you realize you are a charlatan?” he continued.

This tweet is a great example of your paranoia, constant misrepresentation of the facts, and increased anxiety and panic (rightly so) about the Mueller investigation. When will those in Congress and the 30 percent of Americans who still support you realize you are a charlatan? — John O. Brennan (@JohnBrennan) March 5, 2018

Trump had tweeted the claim earlier Monday, declaring the accusation “bigger than Watergate.”

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“Why did the Obama Administration start an investigation into the Trump Campaign (with zero proof of wrongdoing) long before the Election in November? Wanted to discredit so Crooked H would win,” Trump wrote.

Why did the Obama Administration start an investigation into the Trump Campaign (with zero proof of wrongdoing) long before the Election in November? Wanted to discredit so Crooked H would win. Unprecedented. Bigger than Watergate! Plus, Obama did NOTHING about Russian meddling. — Donald J. Trump (@realDonaldTrump) March 5, 2018

Brennan, a frequent critic of Trump, led the CIA when a declassified report from the CIA and other U.S. intelligence agencies was released that said Russia created an influence campaign aimed at interfering in the 2016 election.

Trump in November called Brennan and other intelligence leaders “political hacks” and the investigation into Russia's election interference “a pure hit job.”

Trump has similarly attacked Mueller's probe into Russia's election interference, repeatedly labeling it a "witch hunt."

Mueller charged 13 Russian nationals and three Russian groups last month with interfering in the U.S. election.

He also filed new charges against former Trump campaign staffers Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE and Richard Gates.

A federal court in Virginia in February returned a 32-count superseding indictment charging Manafort and Gates with committing tax fraud, failing to file reports on foreign bank and financial accounts, and bank fraud conspiracy.