Former CIA chief 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 on Saturday blasted President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE for again criticizing the Russia probe as a “witch hunt.”

Brennan, a frequent and harsh critic of the president, responded on Twitter to Trump’s previous tweet highlighting a poll that shows declining support for the special counsel investigation into whether the Trump campaign colluded with Russia.

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“Your fear of exposure is palpable,” Brennan wrote. “Your desperation even more so. When will those of conscience among your Cabinet, inner circle, and Republican leadership realize that your unprincipled and unethical behavior as well as your incompetence are seriously damaging our Nation.”

Your fear of exposure is palpable. Your desperation even more so. When will those of conscience among your Cabinet, inner circle, and Republican leadership realize that your unprincipled and unethical behavior as well as your incompetence are seriously damaging our Nation. https://t.co/n6ivjOYxzo — John O. Brennan (@JohnBrennan) June 23, 2018

Trump has repeatedly attacked the investigation as a “hoax” and “witch hunt.”

His Saturday morning tweet referred to it as a “scam.”

“With all of the bias, lying and hate by the investigators, people want the investigators investigated,” Trump tweeted. “Much more will come out. A total scam and excuse for the Dems losing the Election!”

.@FoxNews Poll numbers plummet on the Democrat inspired and paid for Russian Witch Hunt. With all of the bias, lying and hate by the investigators, people want the investigators investigated. Much more will come out. A total scam and excuse for the Dems losing the Election! — Donald J. Trump (@realDonaldTrump) June 23, 2018

The investigation has resulted in the indictments of multiple former Trump campaign figures and a number of Russian nationals.

Former Trump campaign chairman 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, who is indicted on a series of criminal financial and obstruction of justice charges, was sent to jail earlier this month pending trial, after 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 accused him of witness tampering.