United Nations September 24, 2024 8:24 am WATCH: President Biden's full speech at the United Nations President Joe Biden made his final speech to the United Nations General Assembly on Tuesday and spoke about support for Ukraine and challenges with artificial intelligence. US & World Videos 2:24 The internet's pressing questions about Social Security, answered 1:33 Vance does not recognize Trump's defeat in 2020 2:38 Vance and Walz present different versions of Jan. 6 2:08 Walz defends the importance of gun control 2:08 Vance and Walz clash on abortion