Now Playing: John Brennan fires back at Trump administration

Now Playing: Trump revokes security clearance of former CIA Dir. Brennan, mulling others

Now Playing: Questions arise as Trump pulls ex-CIA director’s security clearance

Now Playing: Shark attack shuts down beach in Cape Cod

Now Playing: College-bound athlete shot dead days before planned departure to start freshman year

Now Playing: ABC News Live: Remembering Aretha Franklin

Now Playing: ‘Queen of Soul’ Aretha Franklin dead at 76

Now Playing: Body of pregnant mother recovered in Colorado: Investigators

Now Playing: Immigrant army veteran files lawsuit in fight to stay in the US

Now Playing: News headlines today: Aug. 16, 2018

Now Playing: Teacher battling cancer thanks colleagues who donated dozens of sick days

Now Playing: ‘Start Here’ podcast: Oklahoma transgender student threatened

Now Playing: Wife, stepson of man who crashed plane into house speak out

Now Playing: Parents speak out for 1st time since son’s football practice death

Now Playing: Chief defends officer who used stun gun on elderly woman

Now Playing: Legislators pledge action amid church sex abuse scandal

Now Playing: Husband arrested in connection to missing wife, daughters

Now Playing: Man airlifted to hospital after Cape Cod shark attack

Now Playing: Mom shocked as child’s toy car bursts into flames

Now Playing: Missing hiker found alive on Mount St. Helens