The greatest threat to national security is we will destroy ourselves, by being ignorant. The United States is a great benevolent and compassionate nation.
We take people at face value as to their intent. We ignore the stated intent of those that would destroy the United States until it is almost too late. There are those that are allowed to enter the United States that would never adapt to our system of government, the freedoms we enjoy and wish on everyone.
These individuals do not want to learn the language and customs of this country, but bring their own customs laws and beliefs to this country and would be pissed , angry and protest if the United State citizen do not accept their way of living.
We believe in freedom of religion, speech and other personal freedoms. There are others that are not citizen or have become citizen that want to impose their religious beliefs to others and would harm or kill those that do not have any interest in their religion. They are not able to reside in peace with other religions and allow others to worship as they see fit.
The United States need to control it's border, screen potential immigrants more stringently. and deport all illegal aliens in this country no matter what country they are from. They are criminals. Criminals do not have any rights in this country, except to have a speedy trial. The speedy trial should be you are here illegally, you will be deported.
I hope this has been of some benefit to you, good luck.