New York Attorney General Letitia James accused former President Donald Trump of withholding information during his civil fraud trial and demanded more information about former Trump Organization CFO Allen Weisselberg’s recent perjury plea, court records show. James filed Thursday a letter to Justice Arthur Engoron requesting a monitor be allowed to investigate the matter, citing an email about the Trump Tower triplex — which was reported to be three times its actual size — the Attorney General says she never received. “We have already raised multiple times the prospect that Defendants have wi…