Donald Tusk

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European Council President Donald Tusk speaks with the media as he arrives for an EU summit at the Europa building in Brussels on Saturday, April 29, 2017. EU Council President Donald Tusk says that Britain will face a united bloc of 27 EU nations in the two years of divorce negotiations and said the welfare of citizens and families living in each other's nations will be the priority once the talks start. (AP Photo/Martin Meissner)

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European Council President Donald Tusk tells reporters the case in which he was questioned for over eight hours as a witness in Warsaw, Poland, is of highly political character, Wednesday, April 19, 2017. The investigation deals with alleged secret illegal contacts between Polish and Russian intelligence officials at a time when Tusk was Poland's prime minister from 2007-2014. (AP Photo/Czarek Sokolowski)

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European Council President Donald Tusk tells reporters the case in which he was questioned for over eight hours as a witness in Warsaw, Poland, is of highly political character, Wednesday, April 19, 2017. The investigation deals with alleged secret illegal contacts between Polish and Russian intelligence officials at a time when Tusk was Poland's prime minister from 2007-2014. (AP Photo/Czarek Sokolowski)

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European Council President Donald Tusk tells reporters the case in which he was questioned for over eight hours as a witness in Warsaw, Poland, is of highly political character, Wednesday, April 19, 2017. The investigation deals with alleged secret illegal contacts between Polish and Russian intelligence officials at a time when Tusk was Poland's prime minister from 2007-2014. (AP Photo/Czarek Sokolowski)

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European Council President Donald Tusk tells reporters the case in which he was questioned for over eight hours as a witness in Warsaw, Poland, is of highly political character, Wednesday, April 19, 2017. The investigation deals with alleged secret illegal contacts between Polish and Russian intelligence officials at a time when Tusk was Poland's prime minister from 2007-2014. (AP Photo/Czarek Sokolowski)

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Donald Tusk, the President of the European Council arrives at the prosecutor office in Warsaw, Poland, Wednesday, April 19, 2017. He ha to testify in an investigation into an alleged secret deal between Polish and Russian intelligence officials. Tusk is to be questioned by prosecutors in Warsaw as a witness. (AP Photo/Czarek Sokolowski)

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Supporters of former Polish Prime Minister and now European Council President Donald Tusk gathered at the Central Railway Station in Warsaw, Poland, Wednesday, April 19, 2017. Tuske has to testify in an investigation into an alleged secret deal between Polish and Russian intelligence officials. He is to be questioned by prosecutors in Warsaw as a witness. (AP Photo/Czarek Sokolowski)

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Supporters of former Polish Prime Minister and European Council President Donald Tusk gather at the Central Railway Station in Warsaw, Poland, Wednesday, April 19, 2017. Tusk has to testify in an investigation into an alleged secret deal between Polish and Russian intelligence officials. Tusk is to be questioned by prosecutors in Warsaw as a witness.(AP Photo/Czarek Sokolowski)

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Supporters of former Polish Prime Minister, European Council President Donald Tusk gather at the Central Railway Station in Warsaw, Poland, Wednesday, April 19, 2017. Tusk has to testify in an investigation into an alleged secret deal between Polish and Russian intelligence officials. Tusk is to be questioned by prosecutors in Warsaw as a witness. (AP Photo/Czarek Sokolowski)

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Supporters of former Polish Prime Minister and now European Council President Donald Tusk gather at the Central Railway Station in Warsaw, Poland, Wednesday, April 19, 2017. Tusk has to testify in an investigation into an alleged secret deal between Polish and Russian intelligence officials. He is to be questioned by prosecutors in Warsaw as a witness. (AP Photo/Czarek Sokolowski)

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Donald Tusk, the President of the European Council walks with supporters as he arrives at the prosecutor office in Warsaw, Poland, Wednesday, April 19, 2017. He has to testify in an investigation into an alleged secret deal between Polish and Russian intelligence officials. Tusk is to be questioned by prosecutors in Warsaw as a witness. (AP Photo/Czarek Sokolowski)

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Supporters of former Polish Prime Minister and European Council President Donald Tusk gather at the Central Railway Station in Warsaw, Poland, Wednesday, April 19, 2017. Tusk has to testify in an investigation into an alleged secret deal between Polish and Russian intelligence officials. Tusk is to be questioned by prosecutors in Warsaw as a witness. (AP Photo/Czarek Sokolowski)

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Donald Tusk, the President of the European Council waves as he arrives at the prosecutor office in Warsaw, Poland, Wednesday, April 19, 2017. He has to testify in an investigation into an alleged secret deal between Polish and Russian intelligence officials. Tusk is to be questioned by prosecutors in Warsaw as a witness. (AP Photo/Czarek Sokolowski)

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President of the European Council Donald Tusk attends a joint press conference in Valletta, Malta, Friday, March 31, 2017. Tusk insisted Friday after a meeting in Malta that withdrawal from the bloc comes ahead of any new relationship with Britain. But he also said the EU will not punish the U.K. in the exit talks, and that the so-called Brexit is punitive enough. (AP Photo/Rene Rossignaud)

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From left, Israeli Prime Minister Benjamin Netanyahu, Malian President Ibrahim Boubacar Keita, French President Francois Hollande, German Chancellor Angela Merkel, EU President Donald Tusk and Palestinian Authority President Mahmoud Abbas march during a rally in Paris, Sunday, Jan. 11, 2015. (AP Photo/Philippe Wojazer, Pool) ** FILE **