Now Playing: Dangerous Heat Leaves Millions of Americans at Risk in the East

Now Playing: Index: Woman Killed in San Antonio Truck Explosion

Now Playing: Hundreds clash with police at street party in Colorado

Now Playing: Warm air spreads across US

Now Playing: Senate passes $1.9 trillion COVID relief package

Now Playing: Drake’s new music video, “What’s Next,” tops the trending list on YouTube

Now Playing: 'Saudi is from my perspective ... a strategic partner in the region': Lloyd Austin

Now Playing: Department of Justice holds listening session with Asian-American and Pacific Island community groups

Now Playing: Harry and Meghan interview with Oprah Winfrey airing tonight

Now Playing: Former Minneapolis police officer Derek Chauvin awaiting trial

Now Playing: 'We have figured out how to make schools safe': Dr. Ashish Jha

Now Playing: NBA All-Star Game still on schedule to play tonight

Now Playing: New York Governor Andrew Cuomo under fire as more accusations of misconduct are broug

Now Playing: Michigan state trooper faces felony assault charges

Now Playing: Bowling Green State University student hospitalized after alleged hazing incident

Now Playing: Police under fire for pepper-spraying woman with 3-year-old child

Now Playing: How life in the US has changed a year into the pandemic

Now Playing: NYC’s Javits Center offers 24/7 COVID vaccinations

Now Playing: ‘GMA3’ exclusive: US Commerce Secretary Gina Raimondo

Now Playing: Warmest air since November in parts of US