An obscure line in the Constitution has become a rallying point for some legal experts and critics of Donald Trump, who fear the president-elect has little intention of making a clean break between his business interests and his new White House role.On his first day in office, they say, Trump could find himself in violation of the seldom-used sentence unless he disentangles himself entirely from his sprawling global empire.There’s just one problem: In all likelihood, it’s up to his fellow Republicans to enforce.Known as the foreign Emoluments Clause, it states that “no person holding any office of profit or trust under them, shall, without the consent of the Congress, accept of any present, emolument, office, or title, of any kind whatever, from any king, prince, or foreign state.” In essence, it bars public officials from taking a gift from a foreign government unless they receive approval from Congress, with the goal of preventing foreign actors from using such a favor to wield influence on American policy.