Jeff Cheng | HK01 via AP

Police try to clear protesters with tear gas outside the Legislative Council in Hong Kong, during the early hours of Tuesday, July 2, 2019. Hundreds of protesters in Hong Kong swarmed into the legislature's main building Monday night, tearing down portraits of legislative leaders and spray-painting pro-democracy slogans on the walls of the main chamber as frustration over a lack of response from the administration to opposition demands boiled over.

AP Photo/Brynn Anderson

Democratic presidential candidate Sen. Kamala Harris, D-Calif., listens to questions in the spin room after the Democratic primary debate hosted by NBC News at the Adrienne Arsht Center for the Performing Art, Thursday, June 27, 2019, in Miami.

AP Photo/Brynn Anderson

From left, New York City Mayor Bill de Blasio, Rep. Tim Ryan, D-Ohio, former Housing and Urban Development Secretary Julian Castro, Sen. Cory Booker, D-N.J., Sen. Elizabeth Warren, D-Mass., former Texas Rep. Beto O Rourke, Sen. Amy Klobuchar, D-Minn., Rep. Tulsi Gabbard, D-Hawaii, Washington Gov. Jay Inslee, and former Maryland Rep. John Delaney pose for a photo on stage before the start of a Democratic primary debate hosted by NBC News at the Adrienne Arsht Center for the Performing Arts, Wednesday, June 26, 2019, in Miami.

Courtesy of the University of Illinois Police Department via AP

This Oct. 11, 2018, file photo shows guests mingling after a ceremony to dedicate the memorial garden for Yingying Zhang, Chinese scholar who disappeared from campus in June 2017. A judge at the trial of a former University of Illinois student charged with killing a visiting Chinese scholar says lawyers should be ready to deliver opening statements by the middle of next week. Thursday, June 6, 2019, is the fourth day of jury selection at Brendt Christensen's trial in Peoria.