[Jabba the Nutt]

After WWII, we had laws on the books for immigrants. They had to answer a questionaire, including whether they had belonged to Nazi or Communist Parties, whether they believed in the overthrow of the US Constitution.

Why not re-introduce questions for immigrants on whether they support jihad, sharia law or the replacement of the US Constitution with Muslim Law. Then, if they have lied, they can be stripped of their US citizenship and deported.

[ElectronVolt]

While this is a very reasonable and excellent idea, you can imagine the hell that would descend upon the politician who proposes it.

[Costumed Vigilante]

Then, if they have lied, they can be stripped of their US citizenship and deported.

Or escorted out of the White House and deported, if they never actually had citizenship...