Donald Trump’s call to bar Muslims at least temporarily from entering the United States sparked a backlash, including from fellow Republican presidential candidates who said it was unconstitutional and unwarranted. "Carter acted after the Iranian government accepted and defended the action by militants who stormed our embassy in Tehran and took our diplomats hostage," said David Martin, a University of Virginia law professor who has written extensively about immigration law. "It was a classic, major, state-to-state confrontation, based on a flagrant violation of ...