Donald Trump on Monday had a social media meltdown, tearing into the criminal justice system and Judge Juan Merchan, the jurist overseeing the ex-president’s criminal hush money cover-up case, hours before the case is set to go to closing arguments. Trump, who less than an hour before complained that the prosecution was going second in closing arguments, something Trump said was a “big advantage” for them, once again took to Truth Social to air his grievances about the criminal case. This time, however, Trump directed the rant at Merchan and appeared to test the boundaries of the gag order imp…