New England Patriots owner Robert Kraft doesn't have the ability to sue the NFL itself as all owners agree to "observe all decisions of the Commissioner of the League in all matters within his jurisdiction," [3.11(A)] which includes penalties for what the Commissioner deems to be "conduct detrimental to the league."
But Kraft and company have finally entered the legal arena, through a method that is far less likely to result in being stripped of his franchise.
The Patriots filed an amicus brief with the Second Circuit, in support of quarterback Tom Brady receiving another hearing, with the possibility of yet another reversal of his suspension.