A former assistant Watergate prosecutor said Wednesday that his official legal opinion on conservative author and conspiracy theorist Jerome Corsi is “liar, liar pants on fire.”

Corsi appeared on Ari Melber's MSNBC show on Wednesday and was grilled about his involvement with special counsel Robert MuellerRobert (Bob) Swan MuellerFox's Cavuto roasts Trump over criticism of network Mueller report fades from political conversation Trump calls for probe of Obama book deal MORE’s probe into Russia’s 2016 election interference and possible collusion between the Trump campaign and Moscow.

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Shortly after Corsi’s interview, former special prosecutor Nick Akerman said “this guy is not telling the truth.”

“Let me start off with my legal opinion,” Ackerman said on MSNBC. “Liar, liar, pants on fire.”

Draft court documents show Corsi initially told investigators that he declined a request from an individual, whom Corsi identified as Roger Stone, to get in touch with WikiLeaks about "pending ... emails."

Corsi later replied to Stone, “Word is friend in embassy plans 2 more dumps. One shortly after I’m back. 2nd in Oct. Impact planned to be very damaging," appearing to refer to WikiLeaks founder Julian Assange and the dump of hacked Democratic emails weeks before the 2016 presidential election.

Stone and Corsi have both denied being in contact with Assange.

The "real killer here that really puts the lie to him," Akerman said, is that Corsi later deleted those emails between Jan. 13, 2017, and March 1, 2017.

“That time period is really significant because that’s when the congressional committee, the Senate committee, was bringing in Roger StoneRoger Jason Stone3 real problems Republicans need to address to win in 2020 Judge rejects Stone's request to dismiss charges Judge dismisses DNC lawsuit against Trump campaign, Russia over election interference MORE and was starting to ask questions about this,” Akerman said. “This is not something that somebody forgets.”

Mueller is probing both Stone and Corsi as part of the investigation into Russia’s election interference.

Corsi told Melber on Wednesday that he “absolutely” intended to help Trump’s campaign by trying to get 2016 Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonGOP struggles with retirement wave Overnight Energy: Trump to revoke California's tailpipe waiver | Democrats propose bill to revoke Trump endangered species rollback | Trump officials finalize rule allowing fewer inspectors at pork plants Mark Mellman: The most important moment in history? MORE’s stolen emails from WikiLeaks.

“Everybody in the world who was in news or political operations after July 22nd 2016 when Assange dumped all these emails on [then-Democratic National Committee Chairwoman] Debbie Wasserman-Schultz and said he had more, everyone wanted to know what they were,” Corsi explained.