The charges against Flynn led to his ouster by Trump in February 2017 and became part of the U.S. investigation led by Special Counsel Robert Mueller into Moscow's alleged meddling to help Trump win the presidency in 2016.

Flynn pleaded guilty in 2017 to his lying to the FBI about his conversations with then Russian Ambassador to the United States Sergey Kislyak, but the 61-year-old retired U.S. Army Lieutenant General withdrew his guilty plea earlier this year, alleging prosecutorial misconduct.

"That's the kind of stuff where you begin to get worried that basic - not just institutional norms - but our basic understanding of rule of law is at risk. And when you start moving in those directions, it can accelerate pretty quickly as we've seen in other places," said Obama, who made the dismissal of the Flynn case the principal reason Democrats should make sure Biden will defeat Trump in the election.

"So I am hoping that all of you feel the same sense of urgency that I do," Obama said. "Whenever I campaign, I've always said, 'Ah, this is the most important election.' Especially obviously when I was on the ballot, that always feels like it's the most important election. This one - I'm not on the ballot - but I am pretty darn invested. We got to make this happen."

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