Family members of victims of the GM recall failure hold photographs during a news conference on the U.S. Capitol grounds in Washington April 1, 2014. General Motors has not yet reported to federal regulators the "vast majority" of 133 cases of safety concerns about ignition switches, House of Representatives Democrats said on Tuesday ahead of congressional testimony by General Motors (GM) Chief Executive Mary Barra. REUTERS/Jonathan Ernst (UNITED STATES - Tags: POLITICS TRANSPORT BUSINESS)