Concluding a complex discussion of the Supreme Court’s 6-3 ruling that handed Donald Trump limited immunity from being prosecuted, former FBI general counsel Andrew Weissmann called out the court’s conservative justices for making up the law as they go along. Appearing on MSNBC along with legal analyst Lisa Rubin and former counselor to the U.S. attorney general, Chuck Rosenberg, Weissmann tried to sum up what had just occurred as all three of them poured over the ruling and attached dissents. “I think there’s a big picture and a small picture,” he explained. “The small picture: what does it m…