A sharply divided US Supreme Court on Tuesday upheld President Donald Trump's ban on travel from several mostly Muslim countries, rejecting a challenge that it discriminated against Muslims or exceeded his authority. A dissenting justice said the outcome was a historic mistake. The 5-4 decision Tuesday is a big victory for Trump on an issue that is central to his presidency, and the court's first substantive ruling on a Trump administration policy. The president quickly tweeted his reaction: "Wow!" Chief Justice John Roberts wrote the majority opinion for the five conservative justices, including Trump nominee Neil Gorsuch. Roberts wrote that presidents have substantial power to regulate immigration. He also rejected the challengers' claim of anti-Muslim bias. (AP)