Federal prosecutors investigating former FBI Director James Comey found that a key witness in their inquiry would be “problematic” and potentially undermine the entire case, according to a damaging leak.

Those investigating Donald Trump’s nemesis found that testimony from Daniel Richman—a law professor who prosecutors claim Comey authorized to leak information to the media—would contradict the claims central to the already shaky case, unnamed sources told ABC News.

Comey, who is due to be arraigned on Wednesday over allegations that he lied to Congress, was charged by U.S. Attorney for the Eastern District of Virginia Lindsey Halligan, a Trump loyalist, even after Richman testified that Comey never actually authorized him to leak stories about the probe into Russia’s interference in the

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