The dual appearance is not yet finalized, warned one of the sources, who requested anonymity to discuss plans that are still private. But if the dual appearance goes forward, it would mark a rare instance of a foreign leader appearing alongside a U.S. presidential candidate on the campaign trail.

A who's who of world leaders is expected to arrive in the United States in the coming days for the 79th session of the UN General Assembly.

Many foreign delegations have already reached out to allies of the former president in an attempt to connect with Trump or his foreign policy advisers, according to several people familiar with those conversations.

At a town hall in Michigan on Tuesday night, Trump said he would meet Indian Prime Minister Narendra Modi next week.

Malgorzata Paprocka, the head of the Polish President's office, told the Polish Press Agency (PAP) that Duda and Trump may meet at the National Shrine of Our Lady of Czestochowa, a Polish-American Roman Catholic shrine near Doylestown, Pennsylvania.

"The president has accepted the invitation, as a Solidarity monument will be unveiled there on that day," Paprocka said, referring to the Solidarity trade union that played a pivotal role in bringing down communist rule in Poland.

"If President Trump also accepts, the meeting will take place," she said, adding that the primary subjects of discussion between Duda and Trump would revolve around enhancing security and reinforcing Poland's standing.”

News of the visit was first reported by LevittownNow.com, a local outlet in Pennsylvania.

Americans of Central and Eastern European descent have become a sought-after voting bloc for both Trump and his Democratic rival, Vice President Kamala Harris, in the lead-up to the November 5 election.

During a debate in Philadelphia earlier in September, Harris referenced Pennsylvania's Polish-American population, while implying that Trump would not be a strong defender of Poland if it were attacked by Russia.

The Trump campaign has rejected that characterization and said that only Trump can effectively negotiate with Russian President Vladimir Putin to end the war in Ukraine.

Trump has hosted several world leaders over the last several months, though they have mainly met with him at his residences in New York and Florida, rather than on the trail.

Trump last met with Duda in New York in April.