The government can't launder a fact out of existence by presenting it in one case.
Flynn has a good argument that whatever lie he told the FBI is not material to the investigation of any crime. A lie has to be material to be criminal. If Flynn had baked beans for breakfast, and told the FBI he didn't, the lie is not material unless the investigation had something to do with baked beans.
“The government can’t launder a fact out of existence...”
That is what they did when presenting the dossier as evidence in the the FISA warrants.
Flynn has a good argument that whatever lie he told the FBI is not material to the investigation of any crime. A lie has to be material to be criminal. If Flynn had baked beans for breakfast, and told the FBI he didn't, the lie is not material unless the investigation had something to do with baked beans.