GOP Sen.(S.C.) on Friday blasted Michael Cohen,'s longtime personal lawyer, over reports that he taped business conversations.

"Michael Cohen's an idiot. To be taping — if he did tape — conversations with his client, that's stupid," Graham said on "The Brian Kilmeade Show."

"I don't know what kind of legal advice Michael Cohen gave Donald Trump. I'm not really impressed with him as a lawyer, just to be honest with you," he added.

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The FBI raided the offices and hotel room of Cohen on Monday. The Justice Department confirmed on Friday that he is part of a criminal investigation.