Now Playing: Students treated for minor injuries after school bus crash

Now Playing: 1 student dead after fiery school bus crash

Now Playing: School bus driver testifies in fatal crash trial

Now Playing: 1 student killed in school bus crash in Indiana: Police

Now Playing: Bush family pastor delivers the homily at funeral

Now Playing: George W. Bush eulogizes his father through tears, laughter

Now Playing: Former Canadian PM: Bush was ‘resolute and brave’

Now Playing: Jenna Bush Hager honors grandfather at funeral

Now Playing: Presidential historian offers touching eulogy at Bush funeral

Now Playing: Granddaughters honor George H.W. Bush at funeral

Now Playing: President Trump arrives at George H.W. Bush funeral

Now Playing: Honor Guard take George H.W. Bush’s casket from US Capitol

Now Playing: Unmarried pregnant teacher fired from Catholic school

Now Playing: News headlines today: Dec. 5, 2018

Now Playing: George H.W. Bush’s legacy includes Americans with Disabilities Act

Now Playing: Kids in Houston pay tribute to George H.W. Bush

Now Playing: New report claims former CBS head obstructed investigation into misconduct

Now Playing: Dow Jones suffers 4th-largest point drop

Now Playing: Mueller recommends no prison time for Michael Flynn

Now Playing: George H.W. Bush remembered by the youngest generation