What does the First Amendment have to do with this?
Congress wouldn't make a law that Muslims could not freely exercise their religion - in their own countries.
How does the 1st Amendment play into immigration? Trump’s saying to control our borders and until someone is an American citizen they have no Constitutional rights.
Few people know that Federal Regulations REQUIRE that the religion of immigrants be asked.
Not asking is breaking federal regulations.
Entry can be refused on that answer.
Rush went into it in some detail, quoting the specific regulation.