Democratic presidential candidate Hillary Rodham Clinton listens to a question at town hall meeting at White Mountain Community College, Thursday, Oct. 29, 2015, in Berlin, N.H. Democratic presidential candidate Hillary Clinton has joined the ranks of politicians and environmentalists calling for a federal investigation of ExxonMobil. At a town hall event in New Hampshire on Thursday, local community organizer Jordan Cichon asked Clinton whether she would call on the Department of Justice to investigate the fossil fuel giant of engaging in a cover-up to mislead the public about the risks of human-caused climate change.