it's a federal law and they work for the fed gov.What do you call trying to enter the United States?
That is domestic laws that they cannot enforce.
A federal law is a domestic law. Perry Mason you are not.
Domestic law. The law or legal system established within a state to govern events, transactions, and persons within or having a connection to that state; also internal, municipal, national, or local law/legal system.
Perry Mason you sure as hell aren't.
Border Patrol and local LEO's can arrest and detain.
They cannot stop anyone from applying for asylum.
Sure they can if they can't set foot into our country.