0bummer&Co and the Regime-From-Hell won’t be happy until it happens, multiple times here.
Like UpChuckie coming out for gun control after every shooting, the regime will want more control over the people. It is, probably, easier to bring C4 over the Southern border, than buy Ammonium Nitrate, one backpack at a time. Deliver it to a passport carrying American ISIL member with a truck.