Maine and three other states on Friday filed the latest court challenge to new Trump administration rules blocking green cards for many immigrants who use public assistance including Medicaid, food stamps and housing vouchers. In a written statement, Maine Attorney General Aaron Frey says the rule is unconstitutional because it will disproportionately block admission of non-white immigrants, and it interferes with Maine’s ability to protect its residents. Joining Maine are California, Oregon and Pennsylvania, as well as the District of Columbia. Nearly half of Americans would be considered a burden if the same standards were applied to U.S.