Israel launched air strikes into Khan Younis overnight, a part of Gaza it had already assaulted and left a few weeks ago. A ground operation now seems likely. It's not the first time Israeli forces claimed to clear Hamas from an area, only to return weeks or months later. Amna Nawaz discussed more with Daniel Byman, author of "A High Price: The Triumphs and Failures of Israeli Counterterrorism." PBS News is supported by - https://www.pbs.org/newshour/about/funders