United States presidential election

Rep. Alexandria Ocasio-Cortez, D-N.Y., walks out of a House of Representatives office building, Tuesday, July 16, 2019, on Capitol Hill in Washington. (AP Photo/Patrick Semansky)

FILE - In this Dec. 12, 2018, file photo, Michael Cohen, President Donald Trump's former lawyer, leaves federal court after his sentencing in New York. Federal prosecutors have told a judge in New York Wednesday, July 17, 2019, that they have concluded their investigation into campaign finance violations committed by Cohen. U.S. District Judge William H. Pauley III said that the conclusion of the case clears the way for the public release of sealed search warrant materials dealing with the investigation. (AP Photo/Craig Ruttle, File)

House Speaker Nancy Pelosi, D-Calif., walks to the House Chamber, Tuesday, July 16, 2019, on Capitol Hill in Washington. (AP Photo/Patrick Semansky)

Rep. Alexandria Ocasio-Cortez, D-N.Y., walks out of a House of Representatives office building, Tuesday, July 16, 2019, on Capitol Hill in Washington. (AP Photo/Patrick Semansky)

Senate Minority Leader Chuck Schumer, D-N.Y., flanked by Sen. Sheldon Whitehouse, D-R.I., left, and Sen. Tom Carper, D-Del., condemns remarks by President Donald Trump as he speaks to reporters following a Democratic policy meeting, at the Capitol in Washington, Tuesday, July 16, 2019. (AP Photo/J. Scott Applewhite)

FILE - In this June 23, 2019, file photo, South Bend Police Chief Scott Ruszkowski, left, speaks as Democratic presidential candidate and South Bend Mayor Pete Buttigieg listens during a town hall community meeting, in South Bend, Ind. A white Indiana police officer who fatally shot a black man, sparking protests and roiling the presidential campaign of Mayor Pete Buttigieg, has resigned. The Fraternal Order of Police announced Sgt. Ryan O’Neill’s resignation from the South Bend Police Department on Monday, July 15. (Robert Franklin/South Bend Tribune via AP, File)

U.S. Rep. Ilhan Omar, D-Minn., joined at right by U.S. Rep. Ayanna Pressley, D-Mass., responds to remarks by President Donald Trump after he called for four Democratic congresswomen of color to go back to their "broken" countries, as he exploited the nation's glaring racial divisions once again for political gain, during a news conference at the Capitol in Washington, Monday, July 15, 2019. All four congresswomen are American citizens and three of the four were born in the U.S. Omar is the first Somali-American in Congress. (AP Photo/J. Scott Applewhite)

FILE - In this March 11, 2019 file photo, Gary Jones, president of the United Auto Workers union addresses delegates to the union's bargaining convention in Detroit. In recent years, Detroit automakers have been at relative peace with the UAW union because times have been good and profit-sharing checks have been fat. That all could change this week when talks open Monday, July 15 on new four-year contracts with the union representing 142,000 workers across the nation. Auto companies want to cut labor costs and end a gap with those at foreign-owned factories in the U.S. At bargaining convention in March, Jones told delegates that the union is raising strike pay and said the union would walk out if necessary. (AP Photo/Carlos Osorio, File)

FILE - In this June 27, 2019, file photo, Democratic presidential candidate South Bend Mayor Pete Buttigieg, left, speaks as former vice president Joe Biden gestures during the Democratic primary debate hosted by NBC News at the Adrienne Arsht Center for the Performing Art in Miami. Biden and Buttigieg represent the generational poles of the crowded Democratic presidential primary. Biden is hoping Democratic voters see his decades of experience as the remedy for Trump's presidency. Buttigieg argues that the moment calls for the energy of a new generation. (AP Photo/Wilfredo Lee, File)

In this June 13, 2019, photo, Steve Marcinkus, an Investigator with the Office of the City Commissioners, demonstrates the ExpressVote XL voting machine at the Reading Terminal Market in Philadelphia. An analysis by The Associated Press has found that the vast majority of the nation’s 10,000 election jurisdictions will be managing their elections on Windows 7 or an even older operating system. (AP Photo/Matt Rourke)