With President Donald Trump present, US Supreme Court justices signalled skepticism on Wednesday toward the legality of his directive to restrict birthright citizenship in the US, part of his hardline immigration approach that would upend the long-held understanding of a key constitutional provision. In his historic visit to the top US judicial body, Trump, wearing a red tie and dark suit, sat in the front row of the public gallery of the ornate courtroom after arriving by motorcade from the Whi...