NEW YORK (Reuters) -A U.S. judge on Tuesday rejected a $30 billion antitrust settlement in which Visa and Mastercard agreed to limit fees they charge merchants that accept their credit and debit cards. U.S. District Judge Margo Brodie in Brooklyn said she was not likely to grant final approval to the settlement, and therefore denied the request by a group of merchants, primarily small businesses, for preliminary approval. Many merchants and trade groups including the National Retail Federation opposed the accord, saying card fees would remain too high, while Visa and Mastercard would retain too much control over card transactions.