If they have something like a suitcase nuke, they could just as easily bring it in via Mexico. The border is wide open as a matter of national policy, and I'm sure those elements of the Mexican army working with the drug lords would happily assist.
First off there is no such thing as a "suitcase" nuke in terms of it being that size - It is more like a "large locker" size nuke -
Additionally it is complete foolishness to suggest such an item could be walked into our border. Much more is happening along our borders regarding WMDs, dirty bombs, profiling, etc...then can openly be talked about (and for very valid reasons!).
Think NSA Op that was outed and the country is worse off because of that.
He warns that the danger is already here - "Could it be planned and executed without coordination with intelligence and security services or their extensive infiltration? Of course this is just an educated guess"
It appears he has, in his mind, called on all the prophets, and seems to be calling for the the beginning of the Apocalypse protraying President Bush as the 1st Horseman, and himself the Second....