In Paris, James Longman reports on the the U.S. women's gymnastics team's gold medal victory at the summer games that's made Simone Biles America's most decorated Olympic gymnast; Mary Bruce has new reporting on Vice President Kamala Harris' plan to blitz several battleground states next week, with her running mate; Marcus Moore has the latest on Israel's retaliatory airstrike on Lebanon's capital city of Beirut, targeting a senior Hezbollah commander who they say is responsible for a rocket attack that killed 12 children on a soccer field in the Golan Heights; and more on tonight's broadcast of World News Tonight with David Muir.