problem with your statement is Flynn was NEVER wire tapped....
The Russian Ambassador Kislyak was legally being monitored/tapped.
Flynn happened to call him... but Kislyak has been monitored for years if not decades and Flynn would have been aware of that as a former DIA director....unless he simply was stupefied by some act of God or simply suffered from a brain fart???
Or, maybe arrogant enough to think president Trump would protect him somehow, from his lawlessness, because he was covering up something harmful to Trump or family by lying to the FBI???
Pushing the ''illegal to tape Flynn angle''
WOULD MOST CERTAINLY have been used by Flynn's lawyers to get everything thrown out, IF they Could have used it legally....