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Presumptive Republican presidential nominee Donald Trump is scheduled to meet with Polish president Andrzej Duda on Wednesday in New York, reports the Associated Press (AP).

The planned dinner meeting, confirmed by a person familiar with the matter according to the AP, comes as European leaders prepare for the possibility that Trump might win the November election and return to the White House.

Leaders of Nato countries are especially concerned given Trump's long history of critical comments about the key western alliance, even after Russia's invasion of Ukraine.

The person was not authorised to speak publicly and spoke on condition of anonymity, says the AP.

According to the news agency, Duda himself told reporters before he departed Warsaw for New York on Tuesday that he hoped to meet with Trump socially" if arrangements worked out, and one of his advisers defended the encounter which was viewed as controversial in Poland.

Today here is no more important partner for the Republic of Poland in international relations than the US, and this is exactly the context in which this meeting should be seen," said the adviser, Magorzata Paprocka.