European mass migration crisis

FILE - In this Wednesday, Dec. 11, 2019, file photo, Swedish climate activist Greta Thunberg listens to speeches before addressing the U.N. climate conference n Madrid, Spain. On Friday, Dec. 13, 2019, The Associated Press reported on a video circulating online and inaccurately described, in some social media posts, as showing Thunberg firing an AR-15 rifle. The shooter in the video is another young Swede named Emmy Slinge. (AP Photo/Paul White)

FILE - In this Nov. 29, 2013, file photo, African migrants cover themselves with blankets after being captured by the Libyan Coast Guard while on a boat heading to Italy, in a detention center for illegal migrants in Abu Salim district on the outskirts of Tripoli, Libya. The United Nations opened its "Gathering and Departure Facility" in Libya a year ago as an alternative to imprisonment in such places as Abu Salim. But Libyan security officials and U.N. and other aid workers inside Libya confirmed that what was supposed to be a place of calm and order has fallen into chaos. (AP Photo/Manu Brabo, File)

Map shows location of Mauritanian city where survivors of a capsized boat are being treated.; 2c x 4 inches; 96.3 mm x 101 mm;

A migrant stands next to a snow covered tent at the Vucjak refugee camp outside Bihac, northwestern Bosnia, Tuesday, Dec. 3, 2019. A European human rights official has demanded immediate closure of a migrant camp in Bosnia where hundreds of people have started refusing food and water to protest dismal living conditions as wintry weather sets in. (AP Photo/Darko Bandic)

In this Oct. 7, 2019, photo, dance instructor Ned Pavlovic, a native of Serbia, teaches his student Rouhy Yazdani, a native of Iran who now lives in Milford, Conn., some ballroom dance moves at the Fred Astaire Dance studio in Orange, Conn. Owners of Ballroom dance studios including the Fred Astaire studio say the immigration clampdown has made it even more difficult to find qualified instructors. The small business owners, U.S. dance studio chains and immigration attorneys say there's greater backlogs for visa applications and an overall increase in evidence requests, including for redundant and unnecessary documents. (AP Photo/Susan Haigh)