EU Council President Donald Tusk holds British Prime Minister Theresa May's Brexit letter which was delivered by Britain's permanent representative to the European Union Tim Barrow that gives notice of the UK's intention to leave the bloc under Article 50 of the EU's Lisbon Treaty, in Brussels, Belgium, Wednesday, March 29, 2017. Barrow hand-delivered the letter signed by Britain's Prime Minister Theresa May that will formally trigger the beginning of Britain's exit from the European Union. (Yves Herman/Pool Photo via AP)
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