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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Virginia Mayo/AP

David Davis arrives to be named as Brexit Chief after a meeting with U.K. Prime Minister Theresa May on Wednesday. Bloomberg/Bloomberg via Getty Images hide caption

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Bloomberg/Bloomberg via Getty Images

A European Union supporter stands with a European Union flag during a picnic against Brexit in London's Green Park on Saturday. Daniel Leal-Olivas /AFP/Getty Images hide caption

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Daniel Leal-Olivas /AFP/Getty Images

Union flags fly as banners across a street in central London on Tuesday. EU leaders attempted to rescue the European project and Prime Minister David Cameron sought to calm fears over the U.K.'s vote to leave the bloc as ratings agencies downgraded the country. Ben Stansall/AFP/Getty Images hide caption

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Ben Stansall/AFP/Getty Images

The Foreign Ministers from EU's founding six countries — Jean Asselborn from Luxemburg, Paolo Gentiloni from Italy, Jean-Marc Ayrault from France, Frank-Walter Steinmeier from Germany, Didier Reynders from Belgium and Bert Koenders from the Netherlands (left to right) — brief the media after a meeting on the so-called Brexit in Berlin, Germany on Saturday. Markus Schreiber/AP hide caption

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Markus Schreiber/AP

A young man hands out "Remain" leaflets outside the polling station at Notre Dame Primary School on Thursday in Glasgow, Scotland. As a nation, Scotland voted to remain in the EU; but as a whole, the United Kingdom opted to leave. Jeff J Mitchell/Getty Images hide caption

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Jeff J Mitchell/Getty Images

An image and floral tributes for Jo Cox, lay on Parliament Square, outside the House of Parliament in London on Friday. The 41-year-old British Member of Parliament was fatally injured in an attack on Thursday in northern England. Matt Dunham/AP hide caption

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Matt Dunham/AP

Members of Médecins Sans Frontières (Doctors Without Borders) and SOS Méditerranée distribute food to migrants and refugees aboard the rescue ship Aquarius on May 25, a day after a rescue operation off the Libyan coast. Gabriel Bouys/AFP/Getty Images hide caption

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Gabriel Bouys/AFP/Getty Images

European Union and U.K. Union Jack flags hang at a meeting for U.K. citizens living in Germany to discuss the implications of the proposed "Brexit" from the EU. Adam Berry/Getty Images hide caption

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Adam Berry/Getty Images

Ukrainian pilot Nadiya Savchenko (center), who was freed from jail in Russia as part of a prisoner exchange, talks to the media upon arrival at Kiev's Boryspil airport on Wednesday. Anatolii Stepanov /AFP/Getty Images hide caption

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Anatolii Stepanov /AFP/Getty Images