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In this Saturday, Aug. 17, 2019 file photo, pro-China supporters take a selfie with a Chinese national flag to support police and anti-violence during a rally at a park in Hong Kong. Twitter said Monday it has suspended more than 200,000 accounts that it believes were part of a Chinese government influence campaign targeting the protest movement in Hong Kong. (AP Photo/Vincent Yu)

FILE - In this Jan. 7, 2019, file photo, Alabama's Najee Harris reaches for the end zone during the first half the NCAA college football playoff championship game against Clemson, in Santa Clara, Calif. Najee Harris has been a presence in Alabama’s backfield pretty much since he arrived as one of the nation’s top recruits. Now, he's finally the lead runner. (AP Photo/David J. Phillip, File)

Hong Kong Chief Executive Carrie Lam listens to reporters questions at a press conference in Hong Kong Tuesday, Aug. 20, 2019. Lam said she’s setting up a “communication platform” to resolve differences in the Chinese city, which has been wracked by months of chaotic anti-government protests. She also said a fact-finding study will look at the causes of the protests and the police response to them. (AP Photo/Vincent Yu)

Britain's Prime Minister Boris Johnson talks to hospital patient Scarlett Gibbons, 5, during a visit to the Royal Cornwall Hospital in Truro, south-west England, Monday Aug. 19, 2019. Johnson is under increasing pressure Monday to recall Parliament after leaked government documents warned of widespread problems if the U.K. leaves the European Union without a Brexit withdrawal agreement. (Peter Nicholls/Pool via AP)

In this photo provided by Twitter user Brenna but in Leo Season, travelers stand in long lines to clear customs at John F. Kennedy International Airport, Friday, Aug. 16, 2019, in New York, due to a temporary computer outage that affected U.S. Customs and Border Protection. (Brenna but in Leo Season via AP)

FILE - In this Sept. 13, 2018, file photo, Elizabeth Smart speaks during a news conference while her father Ed Smart looks on, in Salt Lake City. The father of Utah kidnapping survivor Elizabeth Smart has come out as gay, saying his decision brings challenges but also "huge relief." Ed Smart said in a letter explaining his decision shared Friday, August 16, 2019, with NBC's "Today" show that he no longer feels comfortable being a member of The Church of Jesus Christ of Latter-day Saints, which opposes same-sex relationships. (AP Photo/Rick Bowmer, File)

In this still image from video provided by WLNE-TV, protesters blocking an entrance to the Donald W. Wyatt Detention Facility begin to move as a pickup truck approaches, Wednesday night, Aug. 14, 2019, in Central Falls, R.I. The group, which was protesting federal immigration policies, said at least two people were injured. Rhode Island's attorney general said he is investigating the incident. (WLNE-TV via AP)MANDATORY CREDIT

Officers gather for crowd control near a massive police presence set up outside a house as they investigate an active shooting situation, in Philadelphia, Wednesday, Aug. 14, 2019. (AP Photo/Matt Rourke)