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Democratic presidential hopeful former Colorado Gov. John Hickenlooper speaks during the first round of the second Democratic primary debate of the 2020 presidential campaign season at the Fox Theatre in Detroit on July 30, 2019.

Democratic presidential hopeful Massachusetts Sen. Elizabeth Warren gestures as she speaks during the first round of the second Democratic primary debate of the 2020 presidential campaign season at the Fox Theatre in Detroit on July 30, 2019.

Democratic presidential hopeful Mayor of South Bend, Indiana, Pete Buttigieg is seen on a screen during the first round of the second Democratic primary debate of the 2020 presidential campaign season at the Fox Theatre in Detroit on July 30, 2019.

From left to right, Karlton Culig, Stephanie Chavez, Chris Edwards and Kelsey Fritz pose for a selfie with a cardboard cutout of Senator Cory Garner just before the second Democratic Presidential debate began at the Real de Minas Mexican Grill on July 30, 2019. Chavez, Edwards and Fritz are all with Indivisible Denver, who hosted a watch party during the debate at the restaurant.

Democratic presidential candidate former Colorado Gov. John Hickenlooper, right, gestures while Sen. Bernie Sanders, I-VT, left, Sen. Elizabeth Warren, D-Mass., center left, and former Texas congressman Beto O'Rourke, center right, listen during the Democratic Presidential Debate at the Fox Theatre in Detroit on July 30, 2019.

Rep. Tim Ryan, D-Ohio, speaks during the first of two Democratic presidential primary debates in the Fox Theatre in Detroit on Tuesday, July 30, 2019.

Democratic presidential hopeful U.S. senator from Vermont Bernie Sanders, left, listens as U.S. Senator from Massachusetts Elizabeth Warren speaks during the first round of the second Democratic primary debate of the 2020 presidential campaign season at the Fox Theatre in Detroit on July 30, 2019.

From left: Sen. Amy Klobuchar, D-Minn., Indiana Mayor Pete Buttigieg, Sen. Bernie Sanders, I-Vt., and Sen. Elizabeth Warren, D-Mass., participate in the first of two Democratic presidential primary debates at the Fox Theatre in Detroit, hosted by CNN Tuesday, July 30, 2019.

The audience watches the start of the beginning of the Democratic Presidential Debate at the Fox Theatre in Detroit on July 30, 2019.

Democratic presidential hopeful U.S. senator from Minnesota Amy Klobuchar speaks during the first round of the second Democratic primary debate of the 2020 presidential campaign season at the Fox Theatre in Detroit on July 30, 2019.

Democratic presidential hopeful former U.S. Representative for Texas' 16th congressional district Beto O'Rourke participates in the first round of the second Democratic primary debate of the 2020 presidential campaign season at the Fox Theatre in Detroit on July 30, 2019.

The audience watches the start of the beginning of the Democratic Presidential Debate at the Fox Theatre in Detroit on July 30, 2019.

Former Maryland Rep. John Delaney participates in the first of two Democratic presidential primary debates at the Fox Theatre in Detroit on Tuesday, July 30, 2019.

Democratic presidential hopeful and author Marianne Williamson speaks during the first of two Democratic presidential primary debates at the Fox Theatre in Detroit on July 30, 2019.

Democratic presidential candidate Montana Gov. Steve Bullock speaks during the Democratic Presidential Debate at the Fox Theatre in Detroit on July 30, 2019.

Dana Miller, center, along with other guests, watch the second Democratic Presidential debate hosted by Indivisible Denver at the Real de Minas Mexican Grill on July 30, 2019.

Democratic presidential hopeful Bernie Sanders, I-Vt., participates the first round of the second Democratic primary debate of the 2020 presidential campaign season at the Fox Theatre in Detroit on July 30, 2019.

From left, Marianne Williamson, Rep. Tim Ryan, D-Ohio, Sen. Amy Klobuchar, D-Minn., South Bend Mayor Pete Buttigieg, Sen. Bernie Sanders, I-Vt., Sen. Elizabeth Warren, D-Mass., former Texas Rep. Beto O鈥橰ourke, former Colorado Gov. John Hickenlooper, former Maryland Rep. John Delaney and Montana Gov. Steve Bullock take the stage for the first of two Democratic presidential primary debates hosted by CNN Tuesday, July 30, 2019, in the Fox Theatre in Detroit. The field of 10 candidates is the first of two nights of Democratic debates. The remaining 10 Democratic hopefuls will take the stage for the second debate on July 31.

From left:From left, Marianne Williamson, Rep. Tim Ryan, D-Ohio, Sen. Amy Klobuchar, D-Minn., South Bend Mayor Pete Buttigieg, Sen. Bernie Sanders, I-Vt., Sen. Elizabeth Warren, D-Mass., former Texas Rep. Beto O鈥橰ourke, former Colorado Gov. John Hickenlooper, former Maryland Rep. John Delaney and Montana Gov. Steve Bullock take the stage for the first of two Democratic presidential primary debates hosted by CNN Tuesday, July 30, 2019, in the Fox Theatre in Detroit.Democratic presidential candidates were split into two groups of 10 each to take part in the debate sponsored by CNN held over two nights at Detroit's Fox Theatre.

From left: Presidential hopefuls Marianne Williamson, Rep. Tim Ryan, D-Ohio, Sen. Amy Klobuchar, D-Minn., South Bend Mayor Pete Buttigieg, Sen. Bernie Sanders, I-Vt., Sen. Elizabeth Warren, D-Mass., former Texas Rep. Beto O鈥橰ourke, former Colorado Gov. John Hickenlooper, former Maryland Rep. John Delaney and Montana Gov. Steve Bullock take the stage for the first of two Democratic presidential primary debates hosted by CNN Tuesday, July 30, 2019, in the Fox Theatre in Detroit.

Democratic presidential candidate Indiana Mayor Pete Buttigieg takes the stage at the beginning of the Democratic Presidential Debate at the Fox Theatre in Detroit on July 30, 2019.

Democratic presidential hopeful U.S. senator from Vermont Bernie Sanders arrives on stage for the first round of the second Democratic primary debate of the 2020 presidential campaign season at the Fox Theatre in Detroit on July 30, 2019.

Supporters of U.S. President Donald Trump demonstrate at Grand Circus Park in Detroit on July 30, 2019. Democratic presidential candidates will debate in Detroit July 30 and 31.