Former federal prosecutor Andrew McCarthy said Special Counsel Robert Mueller's probe has turned into a "clown show" as it's seemingly drifted away from its initial purpose of investigating Russia's meddling in the 2016 election and possible collusion between the Trump campaign and Moscow.

McCarthy made the remark on "America's Newsroom" Wednesday in response to several developments in the Mueller investigation.

Mueller's office has accused former Trump campaign chairman Paul Manafort of lying and violating his plea agreement. Manafort, 69, was convicted on multiple counts of financial fraud over the summer in connection to work he completed in Ukraine as a political consultant.

Additionally, conservative author Jerome Corsi announced he would reject a deal with investigators that would have required him to plead guilty to perjury. A draft court filing prepared as part of the abortive plea deal said Corsi notified Trump adviser Roger Stone in August 2016 that WikiLeaks intended to release information damaging to Hillary Clinton's presidential campaign.

McCarthy said that even if Corsi got information from WikiLeaks and gave it to Stone who then gave it to Trump -- although there are no facts that establish that -- it's not a crime.

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"What are they doing here? They are investigating the seamy underbelly of politics, the fact that campaigns go out and try to get dirt on the opposition candidate," McCarthy said. "The underlying thing they're investigating is politics, it's not crime. And it's not a prosecutor's place to do that."

He said if Mueller had a "real case," he would have evidence that the Trump campaign conspired with Russia to hack and release emails from the Democratic National Committee and Hillary Clinton campaign chairman John Podesta.

"They don't have that. What they have is: 'Somebody has unsavory information about our opponent and we're going to try to put it out at a time that is maximal as far as the campaign is concerned,'" McCarthy said, adding Mueller has only charged people for making false statements because of underlying weakness in the case.

Watch more from McCarthy above.

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