caston and gary gray's discussed the future of natural gas exports. the center for strategic and international studies event live at 4:30 p.m. eastern on c-span2, she's been out our free mobile video app, or online at c-span.org. >> will you solemnly swear that in the testimony you are about to give will be the truth, the whole truth, and nothing but the truth, so help you god? >> saturdays watch american history tvs congress investigatess we explore major investigations in our country's history by the u.s. house and senate. each week authors and the strength will tell these stories and see the stork footage from those times and examine the impact and legacy of key congressional hearings. this week the 1975 senate committee hearing leadpipe i don't democratic senator frank church examining alleged abuses within the use intelligence community. watch congress investigates saturdays at 7 p.m. eastern on c-span2. >> nonfiction book lovers, c-span is not a podcast for you. listen the best-selling nonfiction authors and influential interviewers on the "afte