United States presidential election

Senate Minority Leader Sen. Chuck Schumer of N.Y., speaks at a news conference following a Senate policy luncheon on Capitol Hill in Washington, Tuesday, June 25, 2019. (AP Photo/Andrew Harnik)

In this June 27, 2019 photo, Democratic presidential candidates, author Marianne Williamson, former Colorado Gov. John Hickenlooper, entrepreneur Andrew Yang, South Bend Mayor Pete Buttigieg, former Vice President Joe Biden, Sen. Bernie Sanders, I-Vt., Sen. Kamala Harris, D-Calif., Sen. Kirsten Gillibrand, D-N.Y., Colorado Sen. Michael Bennet, and Rep. Eric Swalwell, D-Calif., raise their hands when asked if they would provide healthcare for undocumented immigrants, during the Democratic primary debate hosted by NBC News at the Adrienne Arsht Center for the Performing Arts in Miami. (AP Photo/Wilfredo Lee)

In this Monday, July 1, 2019 photo, a homeless woman moves her belongings in early morning from a street near Los Angeles City Hall (in the background) as crews prepared to clean the area. Los Angeles Mayor Eric Garcetti wants President Donald Trump to visit the city and work with him on the homeless crisis. The Democratic mayor made the public invitation during a radio interview Tuesday, July 2, 2109, after the Republican president called the homeless crisis in Los Angeles, San Francisco and other big cities disgraceful and threatened to intercede. (AP Photo/Richard Vogel)

Gov. Gavin Newsom signs one of the budget trailer bills at Sacramento City College in Sacramento, Calif., Monday, July 1, 2019. Looking on, from left, is Assembly Budget Chairman Phil Ting, D-San Francisco, Assembly Speaker Anthony Rendon, of Lakewood, second from left, State Senate President Pro Tem Toni Atkins, of San Diego, third from left and Senate Budget Chairwoman Holly Mitchell, D-Los Angeles, right.(AP Photo/Rich Pedroncelli)

Russian President Vladimir Putin speaks to the media after the G-20 summit in Osaka, western Japan, Saturday, June 29, 2019. (Mikhail Klimentyev, Sputnik, Kremlin Pool Photo via AP)

In this June 27, 2019, photo, Democratic presidential candidate former Colorado Gov. John Hickenlooper speaks during the Democratic primary debate hosted by NBC News at the Adrienne Arsht Center for the Performing Arts, in Miami. It’s been tough to run for the Democratic presidential nomination as a moderate if your name isn’t Joe Biden. But some candidates hope that’s changing.(AP Photo/Wilfredo Lee)

CORRECTS SPELLING OF GILLIBRAND'S FIRST NAME TO KIRSTEN, INSTEAD OF KRISTEN; CORRECTS BENNET'S TITLE TO SEN., INSTEAD OF FORMER SEN. - Democratic presidential candidates from left, author Marianne Williamson, former Colorado Gov. John Hickenlooper, entrepreneur Andrew Yang, South Bend Mayor Pete Buttigieg, former Vice-President Joe Biden, Sen. Bernie Sanders, I-Vt., Sen. Kamala Harris, D-Calif., Sen. Kirsten Gillibrand, D-N.Y., Colorado Sen. Michael Bennet and Rep. Eric Swalwell, D-Calif., wave as they enter the stage for the second night of the Democratic primary debate hosted by NBC News at the Adrienne Arsht Center for the Performing Arts, Thursday, June 27, 2019, in Miami. (AP Photo/Wilfredo Lee)