In Part One of this Sunday Sitdown Live, "The Barefoot Contessa" Ina Garten joins Willie Geist and fans at City Winery in New York City, for a conversation about her bestselling memoir "Be Ready When the Luck Happens," in which she opens up about her "dour" childhood, starting her own business and having her husband Jeffrey by her side. Health officials say dozens of people have been killed and hundreds more wounded in an attack at a humanitarian aid site in Gaza. The exact circumstances of the deadly incident remain unclear, but three witnesses tell NBC News an Israeli tank fired on a crow as people were on their way to get food and water. The Israeli military says they are unaware of any injuries from their gunfire and are investigating. President Donald Trump has pulled his nomination of Jared Isaacman as the next head of NASA, saying on social media he will announce a new nominee who will be "mission aligned." Meanwhile, overseas, the Trump administration formally provided Iran with a proposal on a potential nuclear agreement. NBC's Vaughn Hillyard reports for Sunday TODAY. Meet the Press moderator Kristen Welker joins Sunday TODAY's Willie Geist to discuss the prospects for President Donald Trump's "Big Beautiful Bill" as it heads to the Senate after the House narrowly passed it. Hazy conditions, caused by smoke from Canadian wildfires, are still threatening the air quality for millions in Midwest and all the way to the Southeast. The dangerous air quality comes as millions in the West are under heat alerts and a severe storm system unleashes tornadoes in Kentucky and Tennessee. NBC's Aaron Gilchrist reports for Sunday TODAY. A group of British climbers have sparked a fierce debate after they reached the summit of Mount Everest in less than a week, crediting xenon gas as their secret weapon to acclimatize much quicker to the higher altitudes. Climbers usually spend five to six weeks climbing from base camp to higher elevations and back again to allow their bodies to get used to the lack of oxygen before reaching the summit of the world's tallest mountain. NBC's Camila Bernal reports in this week's Sunday Focus.