United States presidential election

Democratic presidential candidate former Texas Rep. Beto O'Rourke answers 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)

Rep. Alexandria Ocasio-Cortez, D-N.Y., asks a question during a House Oversight subcommittee hearing into the Trump administration's decision to stop considering requests from immigrants seeking to remain in the country for medical treatment and other hardships, Wednesday, Sept. 11, 2019, in Washington. (AP Photo/Jacquelyn Martin)

FILE - In this April 12, 2018, file photo, packets of raw soybeans are placed on a table at a U.S. soybean company's booth at the international soybean exhibition in Shanghai, China. China has announced some U.S. industrial chemicals will be exempt from tariff hikes imposed in a trade war with Washington but maintained penalties on soybeans, pork and other farm goods. The Ministry of Finance's announcement Wednesday, Sept. 11, 2019 came ahead of October talks aimed at ending the fight over trade and technology that threatens global economic growth. (AP Photo/Andy Wong, File)

FILE - In this May 1, 2019 file photo, National security adviser John Bolton talks to reporters outside the White House in Washington. Trump says he fired national security adviser John Bolton, says they 'disagreed strongly' on many issues. (AP Photo/Evan Vucci)

President Donald Trump, left, gives his support to Dan Bishop, right, a Republican running for the special North Carolina 9th District U.S. Congressional race as he speaks at a rally in Fayetteville, N.C., Monday, Sept. 9, 2019. (AP Photo/Chris Seward)

A voters enters Precinct #25 at the West Charlotte Recreation Center, Tuesday, September 10, 2019 as they cast their ballots in the party primaries and in the 9th District race between Dan Bishop and Dan McCready. Voters across Charlotte and the region went to the polls to vote in local Democrat and Republican primaries, while others, in the now infamous 9th District, voted to send either Dan McCready or Dan Bishop to represent them in Congress. (John D. Simmons/The Charlotte Observer via AP)

President Donald Trump speaks during a campaign rally at the Crown Expo, Monday, Sept. 9, 2019, in Fayetteville, N.C. (AP Photo/Evan Vucci)

In this June 8, 2009, file photo, Republican Alaska Gov. Sarah Palin and her husband Todd Palin arrive at a Republican congressional fundraiser in Washington. Court documents appear to show that the husband of former Alaska governor and 2008 Republican vice presidential nominee Sarah Palin is seeking a divorce. The papers, which provide only initials, were filed Friday by T.M.P. against S.L.P. Todd Palin's middle name is Mitchell and Sarah Palin's middle name is Louise. The documents say the couple married Aug. 29, 1988 — the same as the Palins. Birthdates for the two also correspond. (AP Photo/Manuel Balce Ceneta, File)

President Donald Trump speaks to members of the media on the South Lawn of the White House in Washington, Monday, Sept. 9, 2019, before boarding Marine One for a short trip to Andrews Air Force Base, Md., and then on to North Carolina. (AP Photo/Andrew Harnik)

President Donald Trump boards Air Force One for a trip to North Carolina to survey hurricane damage and attend a campaign rally, Monday, Sept. 9, 2019, at Andrews Air Force Base, Md. (AP Photo/Evan Vucci)