Judge Andrew Napolitano said the FBI's raid on the home of former Trump campaign manager Paul Manafort is a significant development. 

The raid occurred July 26 in Virginia and was confirmed to Fox News today by a spokesman for Manafort.

"FBI agents executed a search warrant at one of Mr. Manafort’s residences. Mr. Manafort has consistently cooperated with law enforcement and other serious inquiries and did so on this occasion as well," said Jason Maloni.

Agents hauled away documents and other materials. Napolitano said on "Outnumbered" that to obtain the search warrant, agents would have had to persuade a judge that there was "probable cause of crime in the place to be searched."

Napolitano said the raid indicates the FBI did not trust that Manafort would preserve the materials they intended to find. 

"That is very damning for Manafort and for the president. ... It tells me there is a there there," he explained, adding there could be some sort of financial misdeed by Manafort unrelated to President Trump. 

He said the danger for the president is that the FBI will indict Manafort "for something irrelevant to the campaign and the Russians and then squeeze him for what he knows that they can use against the president."

The president has repeatedly blasted special counsel Robert Mueller's investigation of his alleged ties to Russia as a "witch hunt."

Last week, it emerged that a grand jury had been impaneled by Mueller in Washington, D.C.

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