Edward M. Pio Roda/CNN

Brooklyn Democratic Debate at the Brooklyn Navy Yards.

Now playing

01:31

The Brooklyn Democratic debate in 90 seconds

Seth Wenig/AP

Democratic presidential candidates Sen. Bernie Sanders, I-Vt., right, and Hillary Clinton speak during the CNN Democratic Presidential Primary Debate at the Brooklyn Navy Yard on Thursday, April 14, 2016 in New York. (AP Photo/Seth Wenig)

Now playing

01:34

First & last Democratic debates were totally different

CNN

CNN DEMOCRATIC PRESIDENTIAL DEBATE

Now playing

01:05

Hillary Clinton loves New York

brooklyn democratic post debate bernie sanders 8_00001427.jpg

Now playing

00:50

Sanders: Tone is different because we have won 7 states

CNN

CNN DEMOCRATIC PRESIDENTIAL DEBATE

Now playing

00:53

Clinton: This is an attack on me and Pres. Obama

CNN

Dirty minus LIVE Program ? RX 552

Now playing

01:07

Sanders: We lost in the Deep South, but we are out now

David Scott Holloway/CNN

Now playing

01:55

CNN vets Clinton on out-of-state guns and NY crimes

David Scott Holloway/CNN

Now playing

01:39

CNN vets Sanders, Clinton on minimum wage

Justin Sullivan/Getty Images North America/Getty Images

NEW YORK, NY - APRIL 14: Democratic Presidential candidates Hillary Clinton and Sen. Bernie Sanders (D-VT) debate during the CNN Democratic Presidential Primary Debate at the Duggal Greenhouse in the Brooklyn Navy Yard on April 14, 2016 in New York City. The candidates are debating ahead of the New York primary to be held April 19. (Photo by Justin Sullivan/Getty Images)

Now playing

02:44

Bernie Sanders on Clinton: 'I do question her judgment'

CNN

CNN DEMOCRATIC PRESIDENTIAL DEBATE

Now playing

02:49

Clinton pressed about releasing speech transcripts

CNN

Now playing

02:30

Clinton campaign won't release speech transcripts

Justin Sullivan/Getty Images North America/Getty Images

NEW YORK, NY - APRIL 14: Democratic Presidential candidates Hillary Clinton and Sen. Bernie Sanders (D-VT) debate during the CNN Democratic Presidential Primary Debate at the Duggal Greenhouse in the Brooklyn Navy Yard on April 14, 2016 in New York City. The candidates are debating ahead of the New York primary to be held April 19. (Photo by Justin Sullivan/Getty Images)

Now playing

02:21

Bernie Sanders, Hillary Clinton battle over big banks

CNN

CNN DEMOCRATIC PRESIDENTIAL DEBATE

Now playing

01:05

Bernie Sanders: I will release my tax returns

Seth Wenig/AP

Democratic presidential candidates Sen. Bernie Sanders, I-Vt., right, and Hillary Clinton speak during the CNN Democratic Presidential Primary Debate at the Brooklyn Navy Yard on Thursday, April 14, 2016 in New York. (AP Photo/Seth Wenig)

Now playing

01:40

Hillary Clinton defends her role in Libya

CNN

CNN DEMOCRATIC PRESIDENTIAL DEBATE

Now playing

01:12

Hillary Clinton apologizes for husband's crime bill

Univision

Now playing

01:30

The Univision Democratic debate in 90 seconds

Univision

Democratic debate Miami Lucia translator whispering deportation orig vstan 06_00010701.jpg

Now playing

01:23

The most touching moment from the Univision debate

Democratic debate Miami clinton sanders climate change orig vstan 07_00013024.jpg

Now playing

01:51

Clinton, Sanders asked about climate change deniers

Univision

Democratic debate Miami bernie sanders hillary clinton immigration records orig vstan _00004816.jpg

Now playing

01:23

Hillary Clinton, Bernie Sanders clash over voting records

Joe Raedle/Getty Images North America/Getty Images

MIAMI, FL - MARCH 09: Democratic presidential candidate Senator Bernie Sanders (D-VT) and Democratic presidential candidate Hillary Clinton debate during the Univision News and Washington Post Democratic Presidential Primary Debate at the Miami Dade College's Kendall Campus on March 9, 2016 in Miami, Florida. Voters in Florida will go to the polls March 15th for the state's primary. (Photo by Joe Raedle/Getty Images)

Now playing

01:09

Clinton, Sanders spar on auto industry bailout

Democratic debate Miami Hillary Clinton email server indicted orig vstan 02_00014015.jpg

Now playing

01:41

Clinton refuses to say if she will drop out over emails

GASTON DE CARDENAS/AFP/Getty Images

Democratic presidential candidates Hillary Clinton (R) and Bernie Sanders participate in the Univision and Washington Post democratic presidential debate at Miami Dade College in Miami, on March 9, 2016.

Now playing

03:09

CNN's Reality Check team inspects Clinton's email claim

CNN debate: New York fight night for Clinton and Sanders