The U.S. Embassy in Kabul advised U.S. citizens at a number of gates at the airport to “leave immediately,” noting “security threats outside the gates.” Secretary of State Antony Blinken said there are approximately 1,500 people who may be Americans stuck in Afghanistan. Anderson Cooper spoke to Najibullah, a permanent resident of the U.S who traveled to Afghanistan for his father’s funeral but is now trying to evacuate. He describes the chaos at the airport. Plus, Johnson & Johnson says their booster shot for their one-shot vaccine generated a big spike in antibodies. CNN’s Chief Medical Correspondent Dr. Sanjay Gupta joins AC360 to discuss J&J’s booster shot data. Airdate: August 25, 2021 Guests: Najibullah Dr. Sanjay Gupta To learn more about how CNN protects listener privacy, visit cnn.com/privacy