European Union Competition Commissioner Margrethe Vestager speaks during a media conference at EU headquarters in Brussels on Tuesday. The European Union says Ireland has given illegal tax benefits to Apple Inc. and must now recover the unpaid back taxes from the U.S. technology company, plus interest. Virginia Mayo/AP hide caption

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Protesters demonstrate against the Transatlantic Trade and Investment Partnership in Germany, in April. Officials conceded that opposition to trade agreements is building on both sides of the Atlantic. Markus Schreiber/AP hide caption

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President Obama is interviewed by Steve Inskeep at the White House on Monday. Ariel Zambelich/NPR hide caption

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Listen to NPR Special Coverage: Obama's Years

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President Obama is interviewed by NPR's Steve Inskeep at the White House on Monday. Mito Habe-Evans/NPR hide caption

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Obama Cautions Against 'Hysteria' Over Brexit Vote

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Ibrahim el-Bakraoui (center) appears in this image provided by the Belgian Federal Police in Brussels, on March 22. Turkish authorities say they warned both Belgium and the Netherlands of his terrorist links when Turkey deported him last year. AP hide caption

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This image provided by the Belgian Federal Police shows a man at Belgium's Zaventem airport whom officials have identified as Ibrahim el Bakraoui. A Belgian prosecutor named him as a suspected suicide bomber in Tuesday's attack on the airport. AP hide caption

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A woman visits a memorial Nov. 16 near the Bataclan concert hall in Paris. The attack on multiple locations in Paris last fall left 130 dead. David Ramos/Getty Images hide caption

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French President Francois Hollande (center right) shakes hands with Turkish Prime Minister Ahmet Davutoglu, (center left) before a meeting during an EU summit in Brussels on Friday. Stephane de Sakutin /AP hide caption

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A migrant woman pictured in the northern Greek border station of Idomeni, on March 8. At least 14,000 people are stranded on the outskirts of the village as EU leaders try to control migrants entering Europe through the Balkan countries. Vadim Ghirda/AP hide caption

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