Biles wins silver in gymnastics floor, her fourth medal in Paris

Simone Biles won a silver medal on floor, her fourth medal of the Paris Olympics. American Jordan Chiles won bronze in the event. In track and field, Team USA's Val Allman won a second straight gold in discus and Noah Lyles won his first heat in the 200 meters after his stunning gold-medal photo finish in the 100 meters. NBC News' Tom Llamas reports.