The Supreme Court appears ready to reject Donald Trump’s war on birthright citizenship. During oral arguments in Trump v. Barbara on Wednesday, most of the justices—including at least two of the president’s own appointees—ranged from skeptical to hostile toward the government’s case.Solicitor General John Sauer, arguing for the administration, invoked the purported dangers of birth tourism, at one point, to illustrate the government’s case for limiting citizenship for newborns. “Based on Chinese...