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Law Professor Jonathan Turley said Lt. Gen. Michael Flynn [Ret.] may be rethinking his guilty plea after new evidence came to light in the Mueller probe.

Flynn, who was President Trump's first national security advisor, is agreeing to plead guilty to lying to the FBI over conversations with Russia's ambassador to the U.S.

"The broader collusion case appears to be thin," Turley said, adding that there are new questions as to whether prosecutors even initially believed Flynn did anything wrong involving Russia.

He cited a 1963 Supreme Court case, Brady v. Maryland, in which the court decided that exculpatory evidence - evidence that may help prove innocence - must be presented to the defendant by the prosecution.

Turley, of George Washington University, said that prior to the firing of FBI Director James Comey, investigators concluded that Flynn did not lie to them.

"That changed when Mueller and his team came in," he said. "They decided to frankly hammer Flynn on that and other possible charges."

He said Flynn may have been convinced into pleading guilty after he suffered reported dire financial losses in court fees, as well as a threat that prosecutors would target his son, Michael Flynn Jr.

"It's very hard to make this catwalk backward" out of a guilty plea," Turley said. "Mueller would also get out of it [then, and] load up on charges and go after [Flynn's] son."

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