Russian President Vladimir Putin, center, attends a high-tech forum for youth in Yaroslavl, Russia, Thursday, Dec. 13, 2018. Putin said that Russia has a big potential for the development of high-tech industries. (Alexei Druzhinin, Sputnik, Kremlin Pool Photo via AP)

People wearing their yellow vests demonstrate Saturday, Dec. 15, 2018 in Marseille, southern France. The "yellow vest" movement, which takes its name from the fluorescent safety vests French motorists must all have in their vehicles, emerged in mid-November as a protest against fuel tax increases. (AP Photo/Claude Paris)

British Prime Minister Theresa May walks by the Union flag and the EU flag as she departs a media conference at an EU summit in Brussels, Friday, Dec. 14, 2018. European Union leaders expressed deep doubts Friday that British Prime Minister Theresa May can live up to her side of their Brexit agreement and they vowed to step up preparations for a potentially-catastrophic no-deal scenario. (AP Photo/Francisco Seco)

FILE - In this Nov. 18, 2018, file photo, Australian Prime Minister Scott Morrison speaks during the APEC 2018 meetings in Port Moresby, Papua New Guinea. Australia has decided to formally recognize west Jerusalem as Israel’s capital, but won’t move its embassy until there’s a peace settlement between Israel and Palestinians, Prime Minister Morrison announced Saturday. (AP Photo/Aaron Favila, File)

A Ukrainian national flag flutters in the wind as people gather to support independent Ukrainian church near the St. Sophia Cathedral in Kiev, Ukraine, Saturday, Dec. 15, 2018. Ukraine's Orthodox clerics gather for a meeting Saturday that is expected to form a new, independent Ukrainian church, and Ukrainian authorities have ramped up pressure on priests to support the move. (AP Photo/Efrem Lukatsky)

CORRECTS SOURCE AND PHOTOGRAPHER - Wisconsin Gov. Scott Walker talks about legislation he signed into law during a news conference Friday, Dec. 14, 2018 in Green Bay, Wis. Walker signed a sweeping package of Republican-written legislation Friday that restricts early voting and weakens the incoming Democratic governor and attorney general, brushing aside complaints that he is enabling a brazen power grab and ignoring the will of voters. (Jim Matthews/The Green Bay Press-Gazette via AP)

In this Nov. 29, 2018, file photo, Sen. Elizabeth Warren, D-Mass., speaks at the American University Washington College of Law in Washington, on her foreign policy vision for the country. Warren sought to solidify her connection with African-American voters Friday, Dec. 14, as she prepares to launch a potential presidential campaign. (AP Photo/Andrew Harnik, File)

FILE- This Jan. 20, 2012, file photo, near Cloverdale in New Mexico's Bootheel region shows a gated part of the Diamond A Ranch and is 77 miles south of Lordsburg, N.M., the nearest U.S. Border Patrol station. A 7-year-old Guatemalan girl, picked up with her father and dozens of other migrants along the remote stretch of the U.S.-Mexico border, has died, federal officials said Friday, Dec. 14, 2018. (AP Photo/Russell Contreras, File)

FILE - In this Jan. 4, 2016, file photo, a U.S. Border Patrol agent patrols Sunland Park along the U.S.-Mexico border next to Ciudad Juarez. A 7-year-old girl who had crossed the U.S.-Mexico border with her father, died after being taken into the custody of the U.S. Border Patrol, federal immigration authorities confirmed Thursday, Dec. 13. (AP Photo/Russell Contreras, File)