Donald Trump loves to brag about the “huge” size of his political rallies, but on Saturday a reporter spotted the ex-president’s supporters leaving the event while he was still speaking. Trump over the weekend spoke in New Jersey, which most polls show is solidly behind the current president, Joe Biden. After the event, the former president was criticized for making a mistake about China and for apparently slurring his speech. Trump spent a good portion of his speech bragging about the size of the crowd, even insisting news cameras turn to face the crowd to show how many people attended the ev…