A U.S. military vehicle drives past an oil pump jack in the countryside of Syria's northeastern city of Qamishli. President Trump is leaving some U.S. troops in Syria, with the goal of controlling Syria's oil fields. But legal experts say exploiting the oil could amount to pillaging — a war crime. Delil Souleiman/AFP/Getty Images hide caption
Democratic Presidential hopeful Sen. Bernie Sanders greets supporters during a rally in Queens, N.Y., earlier this month. NurPhoto/NurPhoto via Getty Images hide caption
A skull door knocker and cobweb decorations on the day before Halloween in Philadelphia. Bastiaan Slabbers/Getty Images hide caption
Sen. Elizabeth Warren, D-Mass., and entrepreneur Andrew Yang talk during a break in the Democratic presidential primary debate hosted by CNN/New York Times. John Minchillo/AP hide caption
Democratic presidential candidates (from left): Sen. Bernie Sanders, former Vice President Joe Biden, Sen. Elizabeth Warren and South Bend, Ind., Mayor Pete Buttigieg during a Democratic presidential debate. John Minchillo/AP hide caption
The gung-ho slogan adopted by some Marines became so well-known that it was turned into a 1943 movie. LMPC/Getty Images hide caption
On Capitol Hill, questions are swirling around the House impeachment inquiry into President Trump. Brendan Smialowski/AFP via Getty Images hide caption
Massachusetts Sen. Elizabeth Warren looks on as South Bend, Ind., Mayor Pete Buttigieg speaks during Tuesday's Democratic presidential debate. Warren's policy positions were described as unrealistic and expensive by her rivals in the Democratic debate. Saul Loeb/AFP via Getty Images hide caption
Men walk past a poster at an NBA exhibition in Beijing on Oct. 8. Jason Lee/Reuters hide caption
President Trump arrives at Joint Base Andrews in Maryland on Thursday aboard Air Force One. Saul Loeb/AFP/Getty Images hide caption
President Trump arrives for a news conference at the United Nations General Assembly on Wednesday. Saul Loeb/AFP/Getty Images hide caption
House Speaker Nancy Pelosi has a decision to make about whether to open impeachment proceedings against President Trump, as more Democrats are moving in favor of it. Win McNamee/Getty Images hide caption
Rep. Rashida Tlaib, D-Mich., joins activists asking for impeachment of President Trump on Capitol Hill on Monday. Brendan Smialowski/AFP/Getty Images hide caption
A photograph taken by the commercial satellite company Planet shows the Abqaiq facility shortly after an attack on Sept. 14. Planet Labs Inc. hide caption