NEW YORK — Donald Trump threw up his hands in frustration Tuesday as a judge scheduled his criminal trial for March 25, putting the former president and current candidate in a Manhattan courtroom in the heat of next year’s presidential primary season.Trump, appearing by video conference at a pretrial hearing in the hush-money case, glowered at the camera as New York Judge Juan Manuel Merchan advised him to cancel all other obligations for the duration of the trial, which could last for several weeks.Trump …