War and unrest

Democratic presidential candidate former Vice President Joe Biden speaks about foreign policy at The Graduate Center at CUNY, Thursday July 11, 2019, in New York. (AP Photo/Bebeto Matthews)

President Donald Trump speaks during a meeting with Canadian Prime Minister Justin Trudeau in the Oval Office of the White House, Thursday, June 20, 2019, in Washington. Trump declared Thursday that "Iran made a very big mistake" in shooting down a U.S. drone but suggested it was an accident rather than a strategic error. (AP Photo/Evan Vucci)

In this Feb. 13, 2018, photo released by the U.S. Air Force, an RQ-4 Global Hawk is seen on the tarmac of Al-Dhafra Air Base near Abu Dhabi, United Arab Emirates. Iran's Revolutionary Guard shot down a U.S. RQ-4 Global Hawk on Thursday, June 20, 2019, amid heightened tensions between Tehran and Washington over its collapsing nuclear deal with world powers, American and Iranian officials said, though they disputed the circumstances of the incident. (Airman 1st Class D. Blake Browning/U.S. Air Force via AP)

This image released by the U.S. Department of Defense on Monday, June 17, 2019, and taken from a U.S. Navy helicopter, shows what the Navy says are members of the Islamic Revolutionary Guard Corps Navy removing an unexploded limpet mine from the M/T Kokuka Courageous. (U.S. Department of Defense via AP)

Britain's Prince Harry speaks on stage during a concert hosted by his charity Sentebale at Hampton Court Palace, in London, Tuesday June 11, 2019. The concert will raise funds and awareness for Sentebale, the charity founded by Prince Harry and Lesotho's Prince Seeiso in 2006, to support children and young people affected by HIV and AIDS in Lesotho, Botswana and Malawi. (AP Photo/Matt Dunham, Pool)

Democratic presidential candidate Bernie Sanders speaks to audience members during a campaign stop at Grand River Center in Dubuque, Iowa, Sunday, June 9, 2019. (Eileen Meslar/Telegraph Herald via AP)

Opposition party supporters cheer as leading opposition challenger Nelson Chamisa arrives at a campaign rally in Bindura, Zimbabwe, Friday July 27, 2018. Chamisa said in an interview with the Associated Press that Monday's historic election is likely to be flawed and that he will lead a campaign of peaceful protests if former Mugabe deputy and current President Emmerson Mnangagwa wins a disputed vote. (AP Photo/Jerome Delay)

FILE- In this Monday July 16, 2018, file photo a supporter of Soumaila Cisse, Opposition Presidential candidate, Union for the Republic and Democracy party hold a poster that reads '' Together lets restore hope'' during an election campaign rally in Yanfolila, Mali. Mali's voters have been warned: Months before the presidential election scheduled to take place Sunday, July 29, 2018, the local branch of al-Qaida issued a statement telling people in this increasingly volatile West African nation to stay away from the polls. (AP Photo/Baba Ahmed,File)

Syrian fighters and civilians hold the national flag as they celebrate the return of government authority to the southern town of Quneitra adjacent to Israeli-occupied Golan Heights, Syria, Friday, July 27, 2018. Syrian government troops recaptured the town, abandoned and largely destroyed by Israel since 1974, from armed groups who controlled it for more than four years. (AP Photo)