Now Playing: Andrew McCabe on President Trump’s relationship with Russia

Now Playing: Andrew McCabe says he was ‘absolutely not’ a leaker to The New York Times

Now Playing: 1-on-1 with former Deputy FBI Director Andrew McCabe

Now Playing: Alan Dershowitz and Dan Abrams on latest in Mueller investigation

Now Playing: R. Kelly spends the night in jail

Now Playing: Patriots owner Robert Kraft spotted at pre-Oscars party

Now Playing: 1 body recovered in deadly Texas cargo jet plane crash

Now Playing: Powerful storms sweep across the country

Now Playing: Cargo jet crashes in Texas

Now Playing: Mother gives birth to twins weeks ahead of schedule along with another surprise

Now Playing: Brutal winter storm targets two-thirds of the nation

Now Playing: R-Kelly jailed on $1 million bond

Now Playing: Cargo jet crashes into Trinity Bay Anahuac, Texas, officials say

Now Playing: R. Kelly bail set at $1 million for sex abuse charges

Now Playing: NASA honors hidden figure Katherine Johnson with building naming in 2017

Now Playing: Snow piles up outside the National Weather Service office in Arizona

Now Playing: Parents outraged after fifth graders in South Carolina pick cotton

Now Playing: More than 140 million Americans subject to dangerous weather alerts this weekend

Now Playing: Robert Kraft charged with soliciting prostitution

Now Playing: Mueller expected to file sentencing memo