Now Playing: Michele Bachmann Gets 'Glittered'

Now Playing: Romney Unemployed? Rough Week for GOP Gaffes

Now Playing: One-on-one with top Democrat on the House Intelligence Committee

Now Playing: Trump 'willing to throw almost anything against the wall:' Former CIA director

Now Playing: Sen. Marco Rubio: ‘North Korea will not denuclearize,’ Kim Jong Un’s efforts ‘all a show’

Now Playing: 'No evidence to support spy theory:' Top House Intel Committee Democrat

Now Playing: This Memorial Day weekend, honoring those who lost their lives in non-combat accidents

Now Playing: One-on-one with Sen. Marco Rubio

Now Playing: NFL 'caved' to Trump and fan base with new policy: Washington Post's Wesley Lowery

Now Playing: Stormy Daniels' lawyer reacts to questions raised about the president's legal web

Now Playing: Giuliani on when Trump learned of $130,000 payment: 'Don't know and doesn't matter'

Now Playing: In Memoriam for April 2018

Now Playing: Dem strategist: Administration 'got caught telling the truth' on $130,000 payment

Now Playing: Trump will 'size Kim Jong Un up' and look for 'real' commitment at summit

Now Playing: North Korea expert: 'Big mistake' to assume Kim Jong Un will give up all weapons

Now Playing: How two pilots' military backgrounds kept them calm during an in-flight emergency

Now Playing: Matthew Dowd: Comments on Sen. McCain 'a reflection of culture' in White House

Now Playing: Texas official on school shooting: 'We cannot...say it's the gun - it's us as a nation'

Now Playing: Parent who lost child to school shooting says focus needs to be on 'prevention'

Now Playing: Axios reporter: Giuliani's job is 'to go on TV and attack' Mueller and investigation