Now Playing: Senior Aide Blames Donald Trump for Debate Performance

Now Playing: Protesters Flood Streets After California Police Shooting

Now Playing: Donald Trump's Campaign Admits Debate Failures

Now Playing: Son Rescued at Sea Speaks Out on Mother's Disappearance

Now Playing: Amanda Knox Speaks Out on Netflix Documentary

Now Playing: Meet Tom Brady, Matt Damon and Ben Affleck For Pizza and Beer

Now Playing: New Sexual Consent App Sparks Controversy

Now Playing: Royals in Love: Decoding Will and Kate's Body Language on Canada Tour

Now Playing: Should You Intervene When Someone's Publicly Disciplining a Child?

Now Playing: Deals and Steals: Exclusive Discounts on Fashion for Fall!

Now Playing: New Technology Could See Packages Delivered Inside Your Home

Now Playing: On Set With the Cast of 'Deepwater Horizon'

Now Playing: Agnes Nixon of 'All My Children' and 'One Life to Live' Dies at 93

Now Playing: FBI Says Hackers Trying to Break Into Voter Databases

Now Playing: Barista Artist Brings Coffee Creations to 'GMA' for National Coffee Day

Now Playing: NJ Transit Train Crashes Into Station, Up to 100 Injured

Now Playing: Tropical Storm Matthew Strengthens in Atlantic

Now Playing: NJ Train Crash Survivor Describes the Scene

Now Playing: Prince George, Princess Charlotte Make Royal Appearance

Now Playing: 'GMA' Hot List: Obamas on the Trail and Amanda Knox Now