He called on Europe to do more to demonstrate that it believes in its future and to invest money to secure its position.

For his part, Polish President Duda thanked his U.S. counterpart for the visit, which he said highlighted the alliance between Poland and the United States. The topics discussed during the meeting of the two leaders included regional security, presence of American soldiers in Poland, tightening economic cooperation and U.S. LNG transports.

Polish Defense Minister Antoni Macierewicz also announced on Thursday morning a deal signed with the United States, concerning the purchase of Patriot missiles.

Meanwhile, a large group of people protested against Trump's climate policy, with the protesters carrying banners saying "global catastrophe","down with Trump" and "there is no planet B".

Greenpeace activists illuminated the Palace of Culture and Science with words "No Trump Yes Paris".

Trump is next headed for Hamburg, Germany, where he will attend the G20 summit.

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