Now Playing: President Obama: I Won't Speak at Malia's Graduation Because 'I'm Going to Cry'

Now Playing: President Obama Makes Historic Trip to Cuba

Now Playing: Deal Paves Way for Commercial Flights Into Cuba

Now Playing: Redemption through politics

Now Playing: 'This is a time where you need national unity' but it's the opposite: Rick Klein

Now Playing: How COVID-19 could impact Biden’s Presidency

Now Playing: Federal moratorium on evictions expired overnight

Now Playing: 'I would support subpoenas… if that's the leader that's the leader': Kinzinger

Now Playing: 'Every American is going to see a difference' with infrastructure deal: Buttigieg

Now Playing: COVID-19 cases are rising. Americans’ thoughts on next steps. | FiveThirtyEight

Now Playing: New questions for former President Donald Trump around taxes and election

Now Playing: ABC News Live Prime: Friday, July 30, 2021

Now Playing: The Rundown: Top headlines today: July 30, 2021

Now Playing: ‘Super-spreaders of digital disinformation’ hindering COVID vaccine efforts

Now Playing: Alexandria Ocasio Cortez slams White House, party leaders over eviction situation

Now Playing: Congress fails to extend eviction moratorium ahead of summer recess

Now Playing: Newly released handwritten notes show Trump pressured DOJ on election

Now Playing: How to watch karate like an Olympic judge | FiveThirtyEight

Now Playing: Biden hosts Cuban American leaders at White House

Now Playing: The Breakdown: CDC says 'war has changed' due to delta variant