Directly, it won't.
But it will reduce the numbers of foreign nationals entering U.S. territory illegally and make it significantly more difficult for actual foreign terrorists to blend in among the millions of illegal aliens present within U.S. borders.
There is no way, outside of going completely isolationist, to "prevent" *foreign* terrorists from crossing into U.S. territory, or in other words, guarantee with exactly 100 percent certainty that no *foreign* terrorists can cross U.S. borders. And speaking of domestic terrorists, would you prefer that the U.S. become a police state in order to "prevent" *domestic* terrorists from committing crimes within U.S. borders?
The best that can be done to reasonably ensure the security of U.S. territory and lawfully-present persons within said territory, while simultaneously preserving their individual freedom and liberty, is three-fold: one, enforce valid immigration law; two, remove the incentives for foreign nationals to enter and reside in the United States illegally, or, i.e., no more public benefits, no more anchor baby citizenship, no more free education, etc; and three, abide by the Second Amendment, which defines the unconditional right of the individual to bear arms, whether in defense of self, household, and property or in defense of community (via a militia).
I hate to be the one to tell you this, ut radical Jihadists do not come into teh country to take advnatage of “incentives.”
They come in fully funded to kill us!
We are far from a Police State, but will we be if we follow Paul and wait until they are freely roaming our streets, setting up ied’s and suicide bombings?
I’d much rather fight them over there and not here on our streets.