A former U.S. attorney on Sunday defended the FBI raid on Michael Cohen, President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE’s longtime personal lawyer, and disputed the president’s claim that it violated attorney-client privilege.

“I don’t think that Donald Trump has a decent understanding of what the attorney-client privilege is and how it can be pierced,” said Bharara, who was nominated by former President Obama to serve as the U.S. attorney for the Southern District of New York in 2009 and served nearly eight years in the position. He was removed after Trump's election.

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Bharara, who made the remarks during an appearance on CNN’s “State of the Union,” vouched for the expertise and judgment of the federal prosecutors in the office who oversaw the raid of Cohen’s office last week.

He argued that Cohen’s services for Trump went well beyond the providing of legal advice that would be covered by attorney-client privilege.

“Michael Cohen, from everything you’ve seen in that brief, is barely a lawyer,” Bharara said of the legal brief to a judge requesting authority for the raid.

“I think that you have to trust that that office is doing things by the book, that it’s crossing every ‘t’ and dotting every ‘i,’” Bharara said.

Bharara said he personally knows the federal prosecutors from having worked with them, insisting they “are all people who are professionals, who know what they’re doing, who do things by the book.”

He noted that the raids on Cohen’s office, home and hotel room were approved by Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE and the Office of Enforcement Operations at the Department of Justice.

“There are career professionals in Washington and New York alongside a judge who had to prove all this to see the searches were OK,” he added.

Bharara said the request for a search warrant was “very meticulous” in explaining why Cohen’s office and residences needed to be raided.