Moulton said Trump’s immigration ban also impacts the Arab translators who help soldiers overseas. Rep. Seth Moulton (D-MA), who sits on the House Armed Services Committee, told MSNBC’s Greta Van Susteren that he’s worried President Donald Trump’s Sec. of Defense James Mattis will eventually resign because “his boss is so crazy.”“It seems like Democrats and Republicans like Mattis,” Van Susteren noted.Mattis has worked under both Democratic and Republican administrations.