The case was recently back in the spotlight, more than a year after Mueller concluded his investigation, after the Justice Department disclosed to Flynn's attorneys notes from FBI officials as they deliberated the case.
The decision to drop the charge came amid an internal review into the handling of the case.
"Today's move by the Justice Department has nothing to do with the facts or the law - it is pure politics created to please the president", he said.
"With regard to certain documents in the Michael Flynn matter from the 2016-2017 time period that are now the subject of reporting by the press, the Federal Bureau of Investigation previously produced those materials to the Inspector General and U.S. Attorney Durham", the Federal Bureau of Investigation said. "I wish there were tapes in my case, but [I] learned a lot from Richard Nixon, and you don't do that".
Donald Trump and his campaign team sought and received Russian assistance in 2016, and after the election, incoming White House National Security Advisor Michael Flynn quietly assured Moscow that the new Republican administration wouldn't be almost as tough on Russia as the Obama administration.
The president in March said he was strongly considering a full pardon for Flynn.
"He's been a great partner to me in our effort to restore the American people's confidence in both the Department of Justice and the FBI", Barr told CBS News Thursday. She added that Barr's department was "dropping the case to continue to cover up for the president".
And here the evidence is really overwhelming.
The DOJ found that the FBI's 2017 interview of Flynn - who was Trump's first national security adviser - was "untethered to, and unjustified by, the FBI's counterintelligence investigation into Mr. Flynn" and was "conducted without any legitimate investigative basis".
Barr was appointed by Trump long after Flynn was charged. Asked about the fact that Flynn lied to investigators, Barr said: "Well, people sometimes plead to things that turn out not to be crimes".
However, Flynn has been seeking to withdraw his plea and avoid a potential prison term after he fired his original legal team.
President Trump on Friday said he "learned a lot from Richard Nixon" as he reflected on his handling of the Russian Federation investigation. Later that month, though, as the White House insisted that Flynn hadn't discussed sanctions with Russian Ambassador Sergey Kislyak, FBI officials grew increasingly concerned by Flynn's conversations with the diplomat and kept the investigation open to question him about that.
The president's ire about the investigation was rekindled on Thursday. "They did not have a basis for the counterintelligence investigation against Flynn". "And they asked him if he remembered saying that, and he said he didn't remember that".
Grimes Reveals the Meaning Behind Her & Elon Musk's Baby's Name
If you're confused about the pronunciation of the boy's name, you're not alone. "They may decide their fate and identity". The Lockheed A-12 is a now retired reconnaissance aircraft built for the Central Intelligence Agency in the 1960s.