The CEO of the nation's largest private for-profit hospital chain is under fire for ignoring a subpoena to testify before the Senate. The hearing examined the financial collapse of Steward Health Care, a group created by a private equity firm that generated huge fortunes for investors and its CEO, but left patients in dangerous conditions. William Brangham discussed more with Mark Arsenault. PBS News is supported by - https://www.pbs.org/newshour/about/funders