Now Playing: Affordable Care Act expert explains what the changes mean for you
Now Playing: Fallout from Trump’s decision to stop Obamacare
Now Playing: Trump threatens to ‘decertify’ the Iran Nuclear agreement
Now Playing: Trump vows to rip apart Obamacare piece by piece
Now Playing: Chief of Staff John Kelly: ‘I’m not quitting today’
Now Playing: Trump takes hard line on Iran, but keeps Obama deal in place
Now Playing: President Trump decertifies Iran deal
Now Playing: Trump talks about Iran nuclear deal
Now Playing: Trump touts his defense of the First Amendment
Now Playing: Trump speaks at conservative Values Voter Summit
Now Playing: Trump to Puerto Rico: ‘We’ll be there’
Now Playing: Members of Trump’s White House who’ve denied they’re departing
Now Playing: Trump to end Obamacare subsidies that help low-income Americans
Now Playing: The Note: Trump takes consequential steps on Iran deal, health care
Now Playing: Trump tweets that FEMA, the military and first responders cannot stay in Puerto Rico forever
Now Playing: White House chief of staff: ‘I’m not quitting today … I don’t think I’m being fired today.’
Now Playing: Biden: New campus sex assault guidelines not an improvement
Now Playing: Trump nominates Kirstjen Nielsen as homeland security secretary
Now Playing: Trump announces nominee for DHS secretary
Now Playing: ‘The Briefing Room’: Chief of staff John Kelly gives first White House press briefing
