Democratic presidential hopefuls Former Vice President Joe Biden (L), Massachusetts Senator Elizabeth Warren (C) and California Senator Kamala Harris (R) speak during the third Democratic primary debate of the 2020 presidential campaign season hosted by ABC News in partnership with Univision at Texas Southern University in Houston, Texas on September 12, 2019. (Photo by Robyn BECK / AFP) (Photo credit should read ROBYN BECK/AFP/Getty Images)

21 Images

Candidates face off in third Democratic debate in Houston

Democratic presidential hopefuls former Vice President Joe Biden, Massachusetts Sen. Elizabeth Warren and California Sen. Kamala Harris speak during the third Democratic primary debate in Houston. (Robyn Beck / AFP/Getty Images)

HOUSTON, TEXAS - SEPTEMBER 12: Security apprehends protesters during the Democratic Presidential Debate at Texas Southern University's Health and PE Center on September 12, 2019 in Houston, Texas. Ten Democratic presidential hopefuls were chosen from the larger field of candidates to participate in the debate hosted by ABC News in partnership with Univision. (Photo by Win McNamee/Getty Images)

Security staffers corral protesters during the debate at Texas Southern University. (Win McNamee / Getty Images)

Democratic presidential hopefuls Minnesota Senator Amy Klobuchar and New Jersey Senator Cory Booker speak during the third Democratic primary debate of the 2020 presidential campaign season hosted by ABC News in partnership with Univision at Texas Southern University in Houston, Texas on September 12, 2019. (Photo by Robyn BECK / AFP) (Photo credit should read ROBYN BECK/AFP/Getty Images)

Minnesota Sen. Amy Klobuchar and New Jersey Sen. Cory Booker. (Robyn Beck / AFP/Getty Images)

HOUSTON, TEXAS - SEPTEMBER 12: Democratic presidential candidate Sen. Cory Booker (D-NJ) smiles for photos from the audience during a break in the Democratic Presidential Debate at Texas Southern University's Health and PE Center on September 12, 2019 in Houston, Texas. Ten Democratic presidential hopefuls were chosen from the larger field of candidates to participate in the debate hosted by ABC News in partnership with Univision. (Photo by Win McNamee/Getty Images)

Cory Booker smiles for photos before the audience during a break. (Win McNamee / Getty Images)

Sen. Kamala Harris, D-Calif., responds to a question Thursday, Sept. 12, 2019, during a Democratic presidential primary debate hosted by ABC at Texas Southern University in Houston. (AP Photo/David J. Phillip)

Sen. Kamala Harris recalls the late Sen. John McCain’s thumbs-down vote that defeated President Trump’s effort to repeal Obamacare. (David J. Phillip / Associated Press)

Sen. Cory Booker, D-N.J., responds to a question Thursday, Sept. 12, 2019, during a Democratic presidential primary debate hosted by ABC at Texas Southern University in Houston. (AP Photo/David J. Phillip)

Sen. Cory Booker responds to a question. (David J. Phillip / Associated Press)

Democratic presidential candidates former Vice President Joe Biden, left and Sen. Elizabeth Warren, D-Mass., talk Thursday, Sept. 12, 2019, during a Democratic presidential primary debate hosted by ABC at Texas Southern University in Houston. (AP Photo/David J. Phillip)

Former Vice President Joe Biden and Sen. Elizabeth Warren during a break. (David J. Phillip / Associated Press)

Former Texas Rep. Beto O'Rourke, right, listens to Andrew Yang, left, Thursday, Sept. 12, 2019, during a Democratic presidential primary debate hosted by ABC at Texas Southern University in Houston. (AP Photo/David J. Phillip)

Former Texas Rep. Beto O’Rourke, right, listens to Andrew Yang. (David J. Phillip / Associated Press)

HOUSTON, TEXAS - SEPTEMBER 12: Democratic presidential candidate former Texas congressman Beto O'Rourke speaks during the Democratic Presidential Debate at Texas Southern University's Health and PE Center on September 12, 2019 in Houston, Texas. Ten Democratic presidential hopefuls were chosen from the larger field of candidates to participate in the debate hosted by ABC News in partnership with Univision. (Photo by Win McNamee/Getty Images)

Beto O’Rourke makes a point. (Win McNamee / Getty Images)

Former Vice President Joe Biden, left, listens as Sen. Elizabeth Warren, D-Mass., right, speaks Thursday, Sept. 12, 2019, during a Democratic presidential primary debate hosted by ABC at Texas Southern University in Houston. (AP Photo/David J. Phillip)

Joe Biden listens as Elizabeth Warren speaks. (David J. Phillip / Associated Press)

Former Vice President Joe Biden, right, listens as Sen. Bernie Sanders, I-Vt., left, speaks Thursday, Sept. 12, 2019, during a Democratic presidential primary debate hosted by ABC at Texas Southern University in Houston. (AP Photo/David J. Phillip)

Bernie Sanders and Joe Biden. (David J. Phillip / Associated Press)

Sen. Bernie Sanders, I-Vt., left, and Sen. Elizabeth Warren, D-Mass., right, listen as former Vice President Joe Biden, center, speaks Thursday, Sept. 12, 2019, during a Democratic presidential primary debate hosted by ABC at Texas Southern University in Houston. (AP Photo/David J. Phillip)

Joe Biden is flanked by Bernie Sanders and Elizabeth Warren. (David J. Phillip / Associated Press)

From left, former Vice President Joe Biden, Sen. Elizabeth Warren, D-Mass., Sen. Kamala Harris, D-Calif., entrepreneur Andrew Yang, and former Texas Rep. Beto O'Rourke are introduced for the Democratic presidential primary debate hosted by ABC on the campus of Texas Southern University Thursday, Sept. 12, 2019, in Houston. (AP Photo/Eric Gay)

From left, Joe Biden, Elizabeth Warren, Kamala Harris, Andrew Yang and Beto O’Rourke before the debate. (Eric Gay / Associated Press)

From left, Democratic presidential candidates Sen. Amy Klobuchar, D-Minn., Sen. Cory Booker, D-N.J., South Bend Mayor Pete Buttigieg, Sen. Bernie Sanders, I-Vt., former Vice President Joe Biden, Sen. Elizabeth Warren, D-Mass., Sen. Kamala Harris, D-Calif., entrepreneur Andrew Yang, former Texas Rep. Beto O'Rourke and former Housing Secretary Julian Castro are introduced Thursday, Sept. 12, 2019, before a Democratic presidential primary debate hosted by ABC at Texas Southern University in Houston. (AP Photo/David J. Phillip)

From left, Sen. Amy Klobuchar, Sen. Cory Booker, South Bend Mayor Pete Buttigieg, Sen. Bernie Sanders, former Vice President Joe Biden, Sen. Elizabeth Warren, Sen. Kamala Harris, entrepreneur Andrew Yang, former Texas Rep. Beto O’Rourke and former Housing Secretary Julian Castro. (David J. Phillip / Associated Press)

From left, Sen. Amy Klobuchar, Sen. Cory Booker, South Bend Mayor Pete Buttigieg, Sen. Bernie Sanders, former Vice President Joe Biden, Sen. Elizabeth Warren, Sen. Kamala Harris, entrepreneur Andrew Yang, former Texas Rep. Beto O’Rourke and former Housing Secretary Julian Castro are introduced. (Eric Gay / Associated Press)

The 10 candidates take the stage before Thursday’s debate. (Eric Gay / Associated Press)

From left, presidential candidates Sen. Bernie Sanders, I-Vt., former Vice President Joe Biden and Sen. Elizabeth Warren, D-Mass., are introduced Thursday, Sept. 12, 2019, before a Democratic presidential primary debate hosted by ABC at Texas Southern University in Houston. (AP Photo/David J. Phillip)

From left, Bernie Sanders, Joe Biden and Elizabeth Warren. (David J. Phillip / Associated Press)

Sen. Bernie Sanders, I-Vt., left, shakes hands with former Vice President Joe Biden, center, and Sen. Elizabeth Warren, D-Mass., right, as they are introduced for the Democratic presidential primary debate hosted by ABC on the campus of Texas Southern University Thursday, Sept. 12, 2019, in Houston. (AP Photo/Eric Gay)

Bernie Sanders, Joe Biden and Elizabeth Warren. (Eric Gay / Associated Press)

Democratic presidential candidates Sen. Bernie Sanders, I-Vt., left, and former Vice President Joe Biden greet each other Thursday, Sept. 12, 2019, before a Democratic presidential primary debate hosted by ABC at Texas Southern University in Houston. (AP Photo/David J. Phillip)

Bernie Sanders and Joe Biden before the debate. (David J. Phillip / Associated Press)

Democratic presidential candidate Sen. Elizabeth Warren, D-Mass., left and Democratic presidential candidate Sen. Kamala Harris, D-Calif. react to the audience Thursday, Sept. 12, 2019, before a Democratic presidential primary debate hosted by ABC at Texas Southern University in Houston. (AP Photo/David J. Phillip)

Elizabeth Warren and Kamala Harris. (David J. Phillip / Associated Press)

Audience members arrive before a Democratic presidential primary debate Thursday, Sept. 12, 2019, at Texas Southern University in Houston. (AP Photo/David J. Phillip)

Audience members take their seats before the Democratic presidential primary debate Thursday, Sept. 12, 2019, at Texas Southern University in Houston. (Associated Press)