Now Playing: Gina Haspel: 'I absolutely was an advocate' for destroying interrogation tapes

Now Playing: CIA director nominee says she wouldn't allow agency to undertake "immoral" activity

Now Playing: Gina Haspel vows not to restart CIA detention program

Now Playing: GOP, Democrats score wins in high-stakes primaries

Now Playing: Firm with Russian ties allegedly made payments to Trump's attorney

Now Playing: Mike Braun delivers victory speech

Now Playing: Blankenship concedes West Virginia race

Now Playing: Indiana Senate race: Mike Braun wins GOP primary

Now Playing: Patrick Morrisey projected to win West Virginia primary

Now Playing: Trump urges voters to reject Blankenship on West Virginia ballot

Now Playing: Firm with ties to Russian oligarch allegedly made payments to Trump's attorney, says adult film star's lawyer

Now Playing: Trump withdraws US from Iran nuclear deal

Now Playing: West Virginia's Republican candidate Don Blankenship calls Sen. Manchin 'easy to beat

Now Playing: Meghan McCain shares update on her father, Sen. John McCain

Now Playing: N.Y. attorney general resigns amid abuse allegations

Now Playing: SPECIAL REPORT: Trump announces US withdrawing from Iran nuclear deal

Now Playing: Trump: 'The United States will withdraw from the Iran nuclear deal'

Now Playing: Schneiderman accusers are 'deeply courageous,' NY gov says

Now Playing: Voters in 4 states go to the polls in high-stakes primaries

Now Playing: First lady launches 'BE BEST' campaign