Use of Nuclear devices would not be a good enough excuse to use Nukes. The military and the State department would be opposed and with no real target to attack just blasting someone who supported them in the past would be silly. American can do far more damage with ROV's and with far less negative reaction. The Americans can play victim to the hilt and pound on various enemies conventionally and point out it did not resort to the use of Nuke as it being a good member of the world community