Deputy Prime Minister Jacek Sasin was on Thursday cited as saying that Trump would be among foreign leaders taking part in the international commemorations in the Polish capital.
"President Trump will certainly be there; we have that confirmed already,” Sasin said in a media interview, as quoted by public broadcaster Polish Radio’s IAR news agency.
He added: “There will be other leaders as well; now all these visits are being confirmed."
Meanwhile, Polish presidential spokesman Błażej Spychalski told the IAR news agency that Trump's visit would only be definitively confirmed when it is officially announced by the White House.
A Polish newspaper reported this month that Trump would spend two days in Poland when he visits the country for the WWII anniversary.
The Polish presidential spokesman was earlier this year quoted as saying that officials from European Union, NATO and Eastern Partnership countries had been invited to take part in observances of the 80th anniversary of the outbreak of World War II on September 1.
Spychalski, press spokesman for the Polish head of state, also said at the time that no Russian officials had been invited to visit Poland to mark the anniversary.
Wojciech Kolarski, a senior aide to Poland's Duda, said earlier this year that German President Frank-Walter Steinmeier would likely visit Poland for anniversary events on September 1.