President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE’s former campaign manager, Corey Lewandowski, ripped the FBI's handling of the investigation into former campaign chairman Paul Manafort, who was indicted on a litany of charges on Monday.

Speaking on Fox Business Network’s "Varney & Co.," Lewandowski pointed to reports that Manafort had been wiretapped before and after the election by U.S. investigators acting under the authority of the Foreign Intelligence Surveillance Act (FISA).

It is unclear when the alleged FISA warrant was issued and the government has not confirmed its existence. But if the reports are true, Lewandowski said it would have been the FBI's responsibility to notify the campaign that Manafort was under investigation so they wouldn't hire him.

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Lewandowski said he and Trump never heard from the FBI.

“If the public reports are true, and there was a time where Paul Manafort was under a FISA warrant before coming to the Trump campaign, why is it the FBI never reached out to me as the campaign manager, never reached out to Donald Trump and said ‘look, you might want to pause for a second and take a look before you bring this guy on board as a volunteer to hunt delegates for you,’ ” Lewandowski said.

“They never did that. He was under a FISA warrant, supposedly, both before and after his tenure at the campaign and the FBI never notified the leading presidential candidate for a major Republican Party race? Never notified him of a potential problem? This is a problem with the FBI if you ask me.”

Manafort is charged with illegal foreign lobbying, tax evasion and money laundering, among other things. He turned himself in to the FBI on Monday. The indictment against Manafort and his business associate, Richard Gates, does not mention Trump or his campaign.

Lewandowski joined Trump in declaring that Manafort’s alleged wrongdoing occurred long before he joined the Trump campaign.

“If Paul Manafort did something in 2006, a decade before he was brought on as a volunteer to the Trump campaign, then he should be accountable for that,” Lewandowski said. “And he and his associate Rick Gates have now been indicted on 12 counts of money laundering and probably tax evasion and probably other things, which have absolutely nothing to do with the campaign, have nothing to do with the Russia investigation, and have nothing to do with the president.”