. >> and then at eight on the presidency, author katherine sinly talks about florence harding and the precedent she set as first lady. >> she'd been this dire straits medically, so she could relate to kinds of things that they were going through. now, it was interesting because out of this veterans cause came the veterans bureau, right? this was the first time the united states actually had a bureau, what we would call the v.a. today, to take care of our veterans. >> for a complete schedule, go to c-span.org. >> a group of 21 american students aged 9-19 is suing president trump over the u.s. government's climate change policy which they claim puts their future in jeopardy. they're seeking a court order that requires the government to quickly reduce carbon dioxide emissions. one of the plaintiffs, 19-year-old college student ty ya hatton and her attorneys, spoke to the commonwealth club of san francisco about the case. this is just over an hour. >> our program tonight is our constitution, our climate and our children. is there a right not to be harmed by climate change? and our speaker