Conservative MSNBC host Joe Scarborough on Monday blasted the Federal Bureau of Investigation (FBI) for what he said was a "fishing expedition" to take down former CIA Director David Petraeus.

Petraeus, a retired four-star general, resigned on Friday after admitting an extramarital affair that had been uncovered when the FBI began investigating threatening emails that were sent from his mistress to another woman.

"You know what I'm going to do today?" Scarborough snarked on Monday. "I'm going to go through my emails that are far more abusive and far more threatening than the ones that this lady probably got, and I'm going to call the FBI. I'm going to demand that they launch an investigation. I want everybody at home to do that as well. This is absolutely ludicrous."

"This is what bothers me," he continued. "They go on this fishing expedition, it ends up that they continue the fishing expedition under the auspices -- by the way, the FBI despises the CIA. The interagency rivalry here is the most heated in government."

"And so you have the FBI taking Petraeus down, a rising star in the intelligence community. The whole thing stinks."

Watch this video from MSNBC's Morning Joe, broadcast Nov. 12, 2012.

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(h/t: Washington Examiner)