Sunday on PBS News Weekend, Israel formally declares war on Hamas as it pummels Gaza in retaliation and the death toll mounts on both sides. We get two perspectives on this weekend's violence and what it means for the Middle East. Plus, a look at the global fentanyl trade and the recent U.S. crackdown on Chinese companies producing and trafficking the illicit drug. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders