"TWA 800: The Crash, The Cover Up, The Conspiracy", a book written by Cashill, was published in July 2016 by Regnery. "The Pitch" described Cashill as a conspiracy theorist; he promotes the theory that TWA 800 was hit by a missile and doubted the veracity of Barack Obama's published birth certificate. "First Strike" (2003), Cashill's earlier book on the crash of TWA Flight 800, alleged the real cause had been covered up to stop Bill Clinton from losing the 1996 presidential election. In a 2004 documentary "Mega Fix", he alleged additionally that cover-ups by President Clinton concerning the Oklahoma City bombing in 1995 and the Atlantic Olympics bombing the following year, contributed to the September 11 attacks. He implies the 1995 and 1996 attacks were the actions of Islamic terrorists.