REUTERS/Bing Guan/File PhotoNEW YORK, April 2 (Reuters) - New York City police have thrown up metal barriers around Trump Tower and blocked roads near Manhattan Criminal Courthouse as they brace for potential protests ahead of Donald Trump's expected surrender to prosecutors on Tuesday. The downtown courthouse, home to criminal and supreme courts, will shut down some courtrooms ahead of Trump's expected appearance, a court official said. However, many Trump supporters online have expressed wariness about public demonstrations, even after Trump called for them, concerned they could be arrested. Trump is expected to fly to New York on Monday from Florida and spend the night at Trump Tower, before arriving early Tuesday morning at the courthouse, a Trump adviser said. A court official told Reuters that courtrooms on higher floors of the courthouse will be closed at 1 p.m., shortly before Trump's expected 2:15 p.m. (1815 GMT) arraignment.

---