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Chinese Vice Premier Liu He, center, poses with U.S. Trade Representative Robert Lighthizer, right, and Treasury Secretary Steven Mnuchin, for photos before holding talks at the Xijiao Conference Center in Shanghai Wednesday, July 31, 2019. (AP Photo/Ng Han Guan, Pool)

People seek information about family members who are prisoners after a riot inside the Regional Recovery Center in Altamira, Brazil, Monday, July 29, 2019. At least 57 prisoners were killed by other inmates during clashes between organized crime groups in the Altamira prison in northern Brazil Monday with 16 of the victims being decapitated, according to prison officials. (Wilson Soares/Panamazonica via AP)

FILE - Flames and smoke rise from Notre Dame cathedral as it burns in Paris, Monday, April 15, 2019. The city of Paris has ordered a deep cleaning of schools nearest Notre Dame, whose lead roof melted away in the fire last April. (AP Photo/Thibault Camus, File)

Firefighters and Police officers stay next to an ICE highspeed train at the main station in Frankfurt, Germany, Monday, July 29, 2019. German police say a child has died after apparently being pushed onto the tracks in front of a train at Frankfurt's main station. Frankfurt police tweeted that they believe a man pushed the child onto the track Monday. They said that one person was arrested and they are investigating whether he was the perpetrator. (Frank Rumpenhorst/dpa via AP)

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In this Thursday, July 25, 2019, photo provided on Friday, July 26, 2019, by the North Korean government, North Korean leader Kim Jong Un watches a missile test in North Korea. A day after two North Korean missile launches rattled Asia, the nation announced Friday that its leader Kim supervised a test of a new-type tactical guided weapon that was meant to be a "solemn warning" about South Korean weapons introduction and its rival's plans to hold military exercises with the United States. Independent journalists were not given access to cover the event depicted in this image distributed by the North Korean government. The content of this image is as provided and cannot be independently verified. Korean language watermark on image as provided by source reads: "KCNA" which is the abbreviation for Korean Central News Agency. (Korean Central News Agency/Korea News Service via AP)

Conservative Party leadership contender Boris Johnson, centre right, leaves his office in Westminster area of London, Monday July 22, 2019. Voting closes Monday in the ballot to elect Britain's next prime minister, from the two contenders Jeremy Hunt and Boris Johnson, as critics of likely winner Boris Johnson condemned his vow to take Britain out of the European Union with or without a Brexit deal.(Yui Mok/PA via AP)

Israeli forces destroy a building in a Palestinian village of Sur Baher, east Jerusalem, Monday, July 22, 2019. Israeli work crews have begun demolishing dozens of Palestinian homes in an east Jerusalem neighborhood. Monday's demolitions cap a years-long legal battle over the buildings, which straddle the city and the occupied West Bank. (AP Photo/Mahmoud Illean)

A British-flagged oil tanker Stena Impero which was seized by the Iran's Revolutionary Guard on Friday is photographed in the Iranian port of Bandar Abbas, Saturday, July 20, 2019. The chairman of Britain's House of Commons Foreign Affairs Committee says military action to free the oil tanker seized by Iran would not be a good choice. Tom Tugendhat said Saturday it would be "extremely unwise" to seek a military solution to the escalating crisis, especially because the vessel has apparently been taken to a well-protected port. (Tasnim News Agency/via AP)

Neil Armstrong/NASA via AP