'Kyiv Stands': Sullivan says U.S. role in defending Ukraine defines Biden's legacy

President Biden is making his final international summit appearance at the G20 in Brazil. It comes as he authorized Ukraine to fire long-range U.S. weapons into Russia. Nick Schifrin sat down with National Security Advisor Jake Sullivan for an exclusive interview to discuss the Middle East, Biden's legacy and that new authorization. PBS News is supported by - https://www.pbs.org/newshour/about/funders