Federal prosecutors investigating former FBI Director James Comey for allegedly making false statements to Congress determined that a central witness in their probe would prove "problematic" and likely prevent them from establishing their case to a jury, sources familiar with their findings told ABC News.

Daniel Richman -- a law professor who prosecutors allege Comey authorized to leak information to the press -- told investigators that the former FBI director instructed him not to engage with the media on at least two occasions and unequivocally said Comey never authorized him to provide information to a reporter anonymously ahead of the 2016 election, the sources said.

Comey, who was indicted last month on charges of making a false statement and obstruction related to 2020

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