 Main supporters of the approval included the President's PLN, which established a coalition with PUSC and ML in Congress to approve the implementation laws in Congress, as well as different business chambers.The main opposition to CAFTA came from PAC, labor unions, environmental organizations and public universities.In April 2007, former PLN Presidential candidate and CAFTA opponent José Miguel Corrales Bolaños won a legal battle at the Supreme Electoral Tribunal, which authorized him to gather over 100,000 signatures to send CAFTA to a referendum and let the people decide the fate of the controversial agreement.