Kenya is a presidential representative democratic republic with a multi-party system. The president is both the head of state and head of government. Executive power is exercised by the government. Legislative power is vested in both the government and the National Assembly and the Senate. The Judiciary is independent of the executive and the legislature. There has been growing concern, especially during former president Daniel arap Moi's tenure, that the executive was increasingly meddling with the affairs of the judiciary.