European mass migration crisis

FILE - In this Feb. 1, 2017, file photo, the Supreme Court is seen in the morning in Washington. The Supreme Court has so far had little to say about Donald Trump’s time as president. That’s about to change. The justices’ first deep dive into a Trump administration policy comes in a dispute over the administration’s ban on travel from some countries with majority Muslim populations. (AP Photo/Jose Luis Magana, File)

In this photo released by the Syrian official news agency SANA, smoke rises after Syrian government airstrikes and shelling hit in Hajar al-Aswad neighborhood held by Islamic State militants, southern Damascus, Syria, Sunday, April 22, 2018. Syrian state media says government forces are pounding districts of southern Damascus held by Islamic State militants with warplanes, helicopters and artillery in a bid to enforce an evacuation deal reached earlier in the week. (SANA via AP)

Residents arrive to the house morning of Mohammed Ayyoub, 14, who was killed during a protest along Gaza's border with Israel, east of Jebaliya Yesterday, at the main road in Jebaliya refugee camp, Gaza Strip, Saturday, April 21, 2018. Israel's defense minister said Saturday that Hamas leaders are the "only culprits" in continued bloodshed on the Gaza border, as the EU and a top U.N. official made new demands to investigate shootings of unarmed Palestinians by Israeli soldiers, including the killing of a 14-year-old boy. (AP Photo/Adel Hana)

Britain's Prince Harry, right and Prime Minister Theresa May attend a Commonwealth Heads of Government Meeting Youth Forum in London, Monday, April 16, 2018. (Simon Dawson/Pool Photo via AP)

Hungarian Prime Minister Viktor Orban smiles during an international press conference in the Parliament building in Budapest, Hungary Tuesday, April 10, 2018, two days after his Fidesz party in coalition with the Christian Democratic Party won a landslide vitory in the general elections. (Lajos Soos/MTI via AP)

In this image dated Wednesday, April 11, 2018, and released by Algerian TV agency Ennahar TV, shows firefighters and civil security officer at the scene of a fatal military plane crash at Boufarik military airbase, near the Algerian capital, Algiers. An Algerian military plane carrying soldiers and their families crashed soon after takeoff Wednesday into a field in northern Algeria, killing 257 people in what appeared to be the North African nation's worst-ever plane crash. (Ennahar TV via AP)

Hungarian Prime Minister and Chairman of Fidesz Party Viktor Orban, center, and Deputy Prime Minister and Chairman of the Christian Democratic Party Zsolt Semjen, left, sing as they celebrate the win of Fidesz and the Christian Democrats at the election night watch event after the general elections in Budapest, Hungary, late Sunday, April 8, 2018. Prime Minister Orban said his "decisive" re-election victory and the super majority in parliament his right-wing populist party appeared to have won Sunday were "an opportunity to defend Hungary." (Szilard Koszticsak/MTI via AP)

Hungarian Prime Minister Viktor Orban addresses his supporters in Budapest, Hungary, Sunday, April 8, 2018. Preliminary results show populist Hungarian Prime Minister Viktor Orban has easily won a third consecutive term and his Fidesz party has regained its super majority in the parliamentary election. (AP Photo/Darko Vojinovic)