WASHINGTON (Reuters) The top Republican on the House Financial Services Committee called on Friday for an investigation into charges that mortgage finance giant Fannie Mae pushed borrowers into a mortgage aid program so it could receive incentive payments from the U.S. government. Spencer Bachus, the top Republican on the House Financial Services Committee, asked panel chairman Barney Frank to hold a hearing to investigate allegations made in a lawsuit filed in June by former Fannie Mae consultant Caroline Herron.