Nightly News Full Broadcast - June 7

90 million Americans under air quality alerts due to Canadian wildfire smoke; former VP Pence makes 2024 presidential run official; high school graduate and stepfather killed in Virginia mass shooting; and more on tonight’s broadcast. 00:00 Intro 01:27 115 million under air quality alerts in the U.S. 06:42 Former VP Mike Pence challenges Trump for GOP nomination 09:10 Trump spokesman testifies in front of Miami grand jury 10:20 Son and stepfather killed in graduation mass shooting 12:06 Federal investigation into child migrant labor expands 13:54 Pope recovering after abdominal surgery 14:13 Melee outside school board over LGBTQ discussion 16:02 Robots transforming the future of farming 18:58 The countdown is on in Paris for 2024 Olympics » Subscribe to NBC News: » Watch more NBC video: NBC News Digital is a collection of innovative and powerful news brands that deliver compelling, diverse and engagi