Want to bet 1000 of those victims whose kids die won't load up their rifles and descend on Washington DC?
National Security EmergencyEO 13618 and Sections of the Patriot Act dealing with commerce, transportation and banking invoked.
Don't think for a moment Trump won't take immediate advantage of this to assign himself extraordinary powers.
Fascists look forward to crushing widespread dissent.
It is what they live for, and it gives them even more support from their fans and voters because they can cast the protesters as "the enemy".