I don’t know if he can sue the government and win, but I suspect he can sue the “attorneys” in the Department of Justice because they had exculpatory evidence which they did not disclose which led to his conviction. He should also file complaints with every bar association to which those attorneys belong seeking the ultimate sanction—revocation of their licenses to practice law.
There really hasn't been any information that I've seen about any disciplinary action against these prosecutors. Sure, the trial judge has found them in contempt, but nothing from Justice, that I've seen. I'm guessing that Justice is going to hide behind the "ongoing investigation", wait for the heat to dissipate and then quietly let these prosecutors and FBI agents go without any fanfare.
Steven's should push to make sure that the prosecutors, at least some of them, are facing disbarment hearings.