The Supreme Court is casting doubt on President Donald Trump’s restrictions on birthright citizenship in a consequential case that was magnified by Trump’s norm-breaking presence in the courtroom. Conservative and liberal justices on Wednesday questioned whether Trump’s order declaring that children born to parents who are in the United States illegally or temporarily are not American citizens comports with either the Constitution or federal law. Trump heard Solicitor General D. John Sauer face one skeptical question after another. Justices asked about the legal basis for the order and voiced more practical concerns. The Republican president spent just over an hour inside the courtroom, staying only for arguments by the government’s lawyer.