A young Muslim boy dismantled an old digital clock, reworked it a little, and scared the crap out of folks at his school. Because he's a Muslim, this got him an invitation from the White House and a claim that the response to his device was an example of Islamophobia. (Frankly, I'm not sure Islamophobia really exists. Truth and reality are defenses.) This summarizes the problem:
If they're coming here because they want part of what we have built and the life we live, and if they're willing to assimilate, they should be welcomed. If they're here to infiltrate and/or invade and/or conquer us, they have to be stopped, rejected, and sent back. We cannot let them turn this country into the kind of place they came here to escape.