Applicants who had scheduled interviews have received emails informing them that their appointments have been postponed and that fresh dates would be communicated later.
Those confrontations remain the backdrop to Minnesota's Democratic primary on Tuesday, which features establishment-backed US Rep. Angie Craig and the more progressive Lt. Gov. Peggy Flanagan.
The state, joined by Minneapolis and St Paul, said the Department of Homeland Security is violating the First Amendment and other constitutional protections.