In March 2004, the National Assembly voted to impeach Roh on charges of breach of election laws and corruption. This motion rallied his supporters and affected the outcome of the parliamentary election held in April, with the ruling party becoming the majority. Roh was reinstated in May by the Constitutional Court, who had overturned the verdict. However, the ruling party then lost its majority in by-elections in 2005, as discontinued reform plans, continual labor unrest, Roh's personal feuds with the media, and diplomatic friction with the United States and Japan caused criticism of the government's competence on political and socioeconomic issues and on foreign affairs.