The Michigan Immigrant Rights Center, the ACLU and Michigan Democratic Rep. Rashida Tlaib spoke on the detentions and alleged disappearance of immigrants in custody at the U.S.-Canada border.

It is the latest immigration twist in a growing legal — and political — showdown between two branches of government.

A woman from Guatemala says she and her two U.S.-born children were held for nearly a week by customs agents in Detroit after a phone app’s directions to the nearest Costco led them to an international bridge connecting the city to Canada.