FILE - In this June 26, 2015 file photo, European Council President Donald Tusk, left, speaks with British Prime Minister David Cameron during a summit of EU leaders in Brussels at which Cameron sought some changes in Britain's terms of membership of the bloc. They didn't prove to be enough as Britain voted in June of that year to leave the EU. It is finally scheduled to actually leave on Jan. 31, 2020 after 47 years of membership. (AP Photo/Geert Vanden Wijngaert, File)
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