Now Playing: Gov. Christie Pressured to Run

Now Playing: Chris Christie Dodges Question on Presidential Run

Now Playing: New Pressure on Chris Christie

Now Playing: 5 self-defense moves everyone should know

Now Playing: White Sox player listed as critical after aneurysm

Now Playing: Nation says goodbye to first lady Barbara Bush

Now Playing: Trump takes on New York Times, DNC in series of tweets

Now Playing: Gunman opens fire at Waffle House outside Nashville

Now Playing: Queen Elizabeth II celebrates 92nd birthday

Now Playing: Student asks most important lady in his life to prom

Now Playing: San Diego Zoo spokesman discusses importance of wildlife conservation

Now Playing: Beyonce was back at Coachella with some surprises

Now Playing: New food being served at baseball stadiums this season

Now Playing: Surfer survives shark, bear attacks within months

Now Playing: Music world celebrates life of influential DJ Avicii

Now Playing: Bush family preparing funeral of former first lady

Now Playing: FAA orders new inspections of fan blades after Southwest incident

Now Playing: Fallout from new DNC lawsuit

Now Playing: Father of three who died in barrage of bullets caught on camera

Now Playing: North Korean leader says nuke program suspended