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Voters receive instructions about their voting machine place by a Venezuelan Bolivarian National Guard officer outside of a poll station during the election for a constitutional assembly in Caracas, Venezuela, Sunday, July 30, 2017. President Nicolas Maduro asked for global acceptance on Sunday as he cast an unusual pre-dawn vote for an all-powerful constitutional assembly that his opponents fear he'll use to replace Venezuelan democracy with a single-party authoritarian system. (AP Photo/Ariana Cubillos)

FILE - In this May 17, 2017, file photo, President Donald Trump talks with Homeland Security Secretary John Kelly during commencement exercises at the U.S. Coast Guard Academy in New London, Conn. Trump named Kelly as his new Chief of Staff on July 28, ousting Reince Priebus. (AP Photo/Susan Walsh)

FILE - In this Dec. 17, 2015, file photo, Martin Shkreli, center, the former hedge fund manager under fire for buying a pharmaceutical company and ratcheting up the price of a life-saving drug, is escorted by law enforcement agents in New York after being taken into custody following a securities probe. Jurors heard testimony from the government's last witness on Tuesday, July 25, 2017, a day after Shkreli's lawyer told the court his client won't take the witness stand during his securities fraud trial. (AP Photo/Craig Ruttle, File)

FILE - In this Sunday, June 11, 2017 file photo, Equality March for Unity and Pride participants march past the White House in Washington. Most LGBT-rights activists never believed Donald Trump's campaign promises to be their friend. With his move to ban transgender people from military service on Wednesday, July 26, 2017, on top of other actions and appointments, they now see him as openly hostile. (AP Photo/Carolyn Kaster)

FILE - This July 22, 2017 file photo provided by the Merced County Sheriff, shows Obdulia Sanchez, in Merced, Calif. Prosecutors charged Sanchez, a teenage driver on Wednesday, July 26, with vehicular manslaughter while intoxicated and other counts after she lost control of her car while livestreaming on Instagram and recorded a crash that killed her younger sister. Sanchez was driving the car on Friday when it veered onto the shoulder of a road about 75 miles northwest of Fresno, authorities said. (Merced County Sheriff via AP, File)

Brigitte Macron, left, the wife of French President Emmanuel Macron welcomes singer Rihanna at the Elysee Palace to meet French President Emmanuel Macron in Paris, France, Wednesday, July 26, 2017. Global Ambassador for the Global Partnership for Education Rihanna meet French President Emmanuel Macron to discuss France's contributions to the Global Partnership for Education. (AP Photo/Michel Euler)

FILE - In this Dec. 17, 2015, file photo, Martin Shkreli, center, the former hedge fund manager under fire for buying a pharmaceutical company and ratcheting up the price of a life-saving drug, is escorted by law enforcement agents in New York after being taken into custody following a securities probe. Jurors heard testimony from the government's last witness on Tuesday, July 25, 2017, a day after Shkreli's lawyer told the court his client won't take the witness stand during his securities fraud trial. (AP Photo/Craig Ruttle, File)

FILE - In this Dec. 17, 2015, file photo, Martin Shkreli, center, the former hedge fund manager under fire for buying a pharmaceutical company and ratcheting up the price of a life-saving drug, is escorted by law enforcement agents in New York after being taken into custody following a securities probe. Jurors heard testimony from the government's last witness on Tuesday, July 25, 2017, a day after Shkreli's lawyer told the court his client won't take the witness stand during his securities fraud trial. (AP Photo/Craig Ruttle, File)