Now Playing: Warning Signs to Jake and Vienna's Split?

Now Playing: The Most Talked About 'Bachelor' Moments

Now Playing: Behind the Scenes of 'The Bachelor'

Now Playing: Who's the Most Hated Bachelor in History?

Now Playing: Why Is America Hooked on 'The Bachelor'?

Now Playing: Tour of the truck cabs these female truck drivers live in while on the road

Now Playing: Female trucker gives self-defense tips

Now Playing: How this female trucker deals with men on the road

Now Playing: Comey does not know why Trump is reluctant to call out Vladimir Putin

Now Playing: Comey weighs in on if he thinks Trump will be impeached

Now Playing: Comey on Trump tweeting about possible 'tapes'

Now Playing: Would Comey be a witness for Robert Mueller?

Now Playing: James Comey Part 3: Trump asks for 'honest loyalty'

Now Playing: James Comey Part 4: Discussing Michael Flynn

Now Playing: James Comey Part 1: Telling Trump about the 'dossier'

Now Playing: James Comey Part 2: The Hillary Clinton email investigation

Now Playing: James Comey Part 5: Are there Trump tapes?

Now Playing: James Comey Part 6: Comey on a Trump impeachment

Now Playing: Comey: 'It's possible' the Russians have something on President Trump

Now Playing: The moment Comey thinks Trump turned on him