NEW YORK/PALM BEACH, Florida, April 3 (Reuters) - Donald Trump, the ex-president and frontrunner for the Republican 2024 nomination, flew into New York City on Monday for an historic court appearance to face charges stemming from a probe into hush money paid to a porn star. Clad in a blue suit and wearing a red tie, Trump walked alone down a flight of stairs from the airplane and climbed into an SUV for a drive in a motorcade to Trump Tower in Manhattan, where upon arrival he waved to people and walked in without making public comments. MAYOR CALLS FOR PROTESTERS TO BE ON 'BEST BEHAVIOR'New York police over the weekend began erecting barricades near Trump Tower and the Manhattan Criminal Court building