Flynn IS a democrat...or at least he was. Obama appointed him as the Director of the defense intelligence agency. He was the primary intelligence adviser to the Secretary of Defense and the Chairman of the Joint Chiefs of Staff. He did not get along with Clapper or Brennan because he thought they were light weights and he opposed the Iran deal and the CIAs massive off the books Middle East operations that supported and armed radicle groups like ISIS. He also called out Obama and contradicted Brennan and Clapper before Congress when he testified that ISIS was a real and growing threat, not some junior varsity.
Yes, that’s the Bongino et al coverage. There’s also the Hillary - Gulen matter.
Flynn as a Democrat is irrelevant. He’s a patriot, all that matters other than being a believer.