Troop deployments

Turkish soldiers, right, and Turkey-backed opposition fighters stand atop a building next to their flags in Syrian town of Ras al Ayn, northeastern Syria, Wednesday, Oct. 23, 2019. Turkish media reports say Turkish troops and their allied Syrian opposition forces are securing a town in northeast Syria after Syrian Kurdish fighters pulled out of the area.(Ugur Can/DHA via AP)

FILE - In this Aug. 28, 2019, file photo, Secretary of Defense Mark Esper speaks to reporters during a briefing at the Pentagon. Esper says the "impulsive" decision by Turkey to invade northern Syria will further destabilize a region already caught up in civil war. Esper says the invasion puts America's Syrian Kurdish partners "in harm's way," but insists the Kurds are not being abandoned. (AP Photo/Manuel Balce Ceneta, File)

During a trip organized by Saudi information ministry, workers fix the damage in Aramco's oil separator at processing facility after the recent Sept. 14 attack in Abqaiq, near Dammam in the Kingdom's Eastern Province, Friday, Sept. 20, 2019. Saudi Arabia allowed journalists access Friday to the site of a missile-and-drone attack on a facility at the heart of the kingdom's oil industry, an assault that disrupted global energy supplies and further raised tensions between the U.S. and Iran. (AP Photo/Amr Nabil)

This Saturday, Sept. 14, 2019, satellite image provided by NASA Worldview shows fires following Yemen's Houthi rebels claiming a drone attack on two major oil installations in eastern Saudi Arabia. The drones attacked the world's largest oil processing facility in Saudi Arabia and a major oilfield operated by Saudi Aramco early Saturday, sparking a huge fire at a processor crucial to global energy supplies. The island shown in the image is Bahrain, while the peninsula in the image is Qatar. (NASA Worldview via AP)

Neri dos Santos Silva, center, is silhouetted against an encroaching fire threat after he spent hours digging trenches to keep the flames from spreading to the farm he works on, in the Nova Santa Helena municipality, in the state of Mato Grosso, Brazil, Friday, Aug. 23, 2019. Under increasing international pressure to contain fires sweeping parts of the Amazon, Brazilian President Jair Bolsonaro on Friday authorized use of the military to battle the massive blazes. (AP Photo/Leo Correa)

Wildfires consume an area near Porto Velho, Brazil, Friday, Aug. 23, 2019. Brazilian state experts have reported a record of nearly 77,000 wildfires across the country so far this year, up 85% over the same period in 2018. Brazil contains about 60% of the Amazon rainforest, whose degradation could have severe consequences for global climate and rainfall. (AP Photo/Victor R. Caivano)

President Donald Trump speaks about the mass shootings in El Paso, Texas and Dayton, Ohio, in the Diplomatic Reception Room of the White House, Monday, Aug. 5, 2019, in Washington. (AP Photo/Evan Vucci)

National Institute of Technology (NIT) students who left Srinagar, Kashmir's main city arrive to board a train to leave for their respective homes from a railway station in Jammu, India, Sunday, Aug. 4, 2019. Thousands of Indian students and visitors were fleeing Indian-controlled Kashmir over the weekend after the government ordered tourists and Hindu pilgrims visiting a Himalayan cave shrine "to curtail their stay" in the disputed territory, citing security concerns. (AP Photo/Channi Anand)

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)