. >> ninan: major changes for commuters at one of the nation's busiest airports. the new ride travelers will have to take to get to their ride share. the last clinic: how new antiabortion laws are impacting women. >> reporter: are you trying to outlaw abortion? >> oh, absolutely. >> ninan: system failure-- it's a high-tech safety feature intended to save lives. the new research raising red flags for pedestrians. a mountain of ice melting away. the concern tonight about what's being called a slow-motion catastrophe. and the happiest birthdays, one teen's surprising present to homeless children. >> this is the cbs weekend news. >> ninan: good evening. i'm reena ninan. house democrats are taking their impeachment inquiry straight to the white house. cbs news has obtained a copy of their subpoena, demanding a long list of documents about president trump's dealings with ukraine. the deadline to respond, october 18. this comes as a possible second whistleblower may come forward, according to "the new york times." ben tracy leads us off tonight. >> the radical democrats

. >> ninan: major changes for commuters at one of the nation's busiest airports. the new ride travelers will have to take to get to their ride share. the last clinic: how new antiabortion laws are impacting women. >> reporter: are you trying to outlaw abortion? >> oh, absolutely. >> ninan: system failure-- it's a high-tech safety feature intended to save lives. the new research raising red flags for pedestrians. a mountain of ice melting