What you need to know about Graham-Cassidy health care bill

Republican’s long-fraught effort to repeal the ACA has regained momentum in the Senate just as a critical deadline looms for the GOP. The new health care bill, sponsored by Sen. Lindsey Graham and Sen. Bill Cassidy, would bring sweeping changes to the current system. Lisa Desjardins and Sarah Kliff of Vox join John Yang to explain the policy and politics behind the bill.