The bill of rights applies to anyone standing on American soil regardless of if they are a citizen, a legal resident, a refugee, or even here “illegally”.

They have the right to bear arms (per their states laws), they have the right to freedom of speech, assembly and religion, they have the right to due process and protection from unreasonable search and seizure.

A lot of what trump says he’s gonna do isn’t possible unless the constitution gets suspended. Which is unlikely but not impossible.