Now Playing: Biden: 'I Didn't Hear Any Whining'

Now Playing: Jake Tapper on Obama's Pep Talk

Now Playing: The 'face' of robocalls testifies that it is as easy as a 'click of a button'

Now Playing: Spat over Haley 'confusion' raises questions about Trump foreign policy

Now Playing: Figure skater to Congress: I reported sexual abuse and was ignored

Now Playing: Trump confident in Pompeo confirmation despite opposition

Now Playing: Jeb Bush reflects on his mom before a speech

Now Playing: Trump and Abe play a round of golf in Florida

Now Playing: 'Powerhouse Politics': House Republicans on who should get the speaker's gavel

Now Playing: Trump says he's willing to walk away from N. Korea talks

Now Playing: EPA internal watchdog finds Pruitt's top aide approved controversial raises

Now Playing: Supreme Court takes up battle between states, web retailers over sales tax

Now Playing: Missouri attorney general says governor may have committed felony

Now Playing: President Trump: U.S., North Korea already talking 'at extremely high levels'

Now Playing: Ending America's 'drug crisis' is top DOJ priority: Sessions

Now Playing: Kentucky Gov. Bevin apologizes to 'those who were hurt' by child sex abuse remarks

Now Playing: Pence's national security adviser pick steps aside

Now Playing: Trump touts GOP's tax cuts in roundtable with Hispanic business leaders

Now Playing: Nikki Haley 'unbelievably proud' of Trump's Syria decision process

Now Playing: Trump lashes out at Comey: 'Untruthful slimeball'