The Act provided that the Electoral Commission was to consist of fifteen members: five representatives selected by the House, five senators selected by the Senate, four Supreme Court justices named in the law, and a fifth Supreme Court justice selected by the other four. The most senior justice was to serve as president of the Commission. Whenever two different electoral vote certificates arrived from any state, the Commission was empowered to determine which return was correct. The Commission's decisions could be overturned only by both houses of Congress.