Now Playing: Curfew Set in Milwaukee Amid Unrest

Now Playing: Donald Trump Suggests 'Extreme Vetting' for Immigrants

Now Playing: Rio Olympics' Latest Medal Count

Now Playing: Brazilian Authorities Investigate Ryan Lochte Robbery in Rio

Now Playing: Victim of Tennessee Ferris Wheel Accident Speaks Out

Now Playing: Michael Phelps on His New Role as a Dad

Now Playing: Couple Sues 'Pokemon Go' Creators Over Pokestops on Private Property

Now Playing: Parts of Louisiana Declared Federal Disaster Areas

Now Playing: Amy Schumer Talks 'The Girl With the Lower Back Tattoo'

Now Playing: Man Charged With Arson in Northern California Fire

Now Playing: Justin Bieber Warns Instagram Followers After Hateful Comments

Now Playing: Study Links Acetaminophen Use in Pregnancy to Childhood Behavioral Problems

Now Playing: Olympics 2016: Simone Manuel and Ryan Murphy Talk Rio Wins

Now Playing: Heat Wave Watch: What Shorts Can You Wear to Work?

Now Playing: 'GMA' Games: It's Ginger vs Jesse in 'Swimming' Showdown

Now Playing: Bone Marrow Transplant Survivor Goes on Adventure of a Lifetime

Now Playing: Overdue Pregnant Woman Wakesurfs to Help Induce Labor

Now Playing: Simone Biles Earns Bronze on Balance Beam in Rio

Now Playing: Allyson Felix Makes History With Seventh Olympic Medal

Now Playing: Returning Soldier Surprises Mother While She's at Work