Here are just some of the twists and turns in the case, which has gone on for more than three years.
Flynn's trip to Russia in 2015, where it was claimed Flynn went without the knowledge or approval of the DIA or anyone in Washington, was proven not to be true.
Flynn was suspected of being compromised by a supposed Russian agent, Cambridge academic Svetlana Lokhova, based on allegations from Western intelligence asset Stefan Halper. This was also proven to be not true.
Flynn's phone calls with then-Russian Ambassador Sergey Kislyak were framed as being incredibly shady and a potential violation of the Logan Act. This allegation was always preposterous.
Unnamed intelligence officials leaked the details of the Flynn-Kislyak phone calls to The Washington Post.
FBI agents Peter Strzok and Joseph Pientka were dispatched by Deputy FBI Director Andrew McCabe to interview Flynn at the White House, even though the FBI had already reviewed the transcripts of the calls and cleared Flynn of any crimes.