Abuse of discretion. Excessive and unprecedent punishment for a 'wrongdoing' where there is no actual proof. Etc. etc. Don't worry too much about it, Brady and the NFLPA has millions of dollars to pay very smart lawyers to challenge and overturn Goodell's ruling.
Look at it this way -- the rulebook says the punishment for having a football outside the PSI range is 25k. Goodell and his goons issued a 1 million dollar fine, docked 2 draft picks, and suspended Brady for 4 games without pay which is 25% of the season and millions of dollars out of his pocket. That is completely out of WHACK!