"...Yeah, it varies, but about one in every 10 that we catch, is from a country like Yemen or Egypt."
800,000/10 = 80,000 (minimum) non mexicans per year. And using the estimate that 1 in 10 mumslims are radical we are still at 8,000/year.
Of the radicals not all will be "trigger pullers." So, by the nature of unconventional warfare, some will be intell gatherers, and some will be logistics specialists. But working together they will be able to wreak a lot of havoc in this country!