Sunday on PBS News Weekend, calls for a cease-fire in Gaza grow louder as the humanitarian crisis widens. How a political battle in Washington is putting the future of a government program that helps fight HIV around the world at risk. The ripple effects of falling Mississippi River levels on barge operators, farmers and consumers. Plus, the story of a trailblazing Native American astronaut. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders