WASHINGTON — Republican presidential candidate Donald Trump vowed on Wednesday to stand by his campaign manager despite the aide’s arrest over a misdemeanor battery charge, drawing criticism from rivals.Trump, in a round of television interviews, played down the incident involving a reporter and campaign manager Corey Lewandowski, 42, who was arrested in Florida on Tuesday.Trump also stood by comments he made Tuesday night that he was abandoning his pledge to support whoever eventually wins the nomination to be the party’s presidential candidate for the Nov.