Marcin Przydacz, head of Nawrocki's International Policy Bureau, said Trump confirmed NATO's Article 5 obligations and assured Poland it would not be affected by planned reductions of US forces in Western Europe.
"It was a very good declaration – a public assurance of an additional 5,000 soldiers," Przydacz told reporters.
He added, however, that the pledge now needed to be followed by concrete decisions at the planning level, involving both the Pentagon and Poland's defence ministry.
Infrastructure remained a key practical question.
"The fact that soldiers will come to Poland is one thing, but we also need to know where they will go, which base, which location, where they will be housed," Przydacz said.
The Polish president had been invited to Washington to mark Trump's 80th birthday celebrations, which coincided with commemorations of the 250th anniversary of the US Declaration of Independence.
Przydacz said Nawrocki was the only foreign head of state present at Sunday's events.
At a banquet ahead of the UFC Freedom 250 show, the Polish president held talks with US Vice President JD Vance, Secretary of State Marco Rubio and Defence Secretary Pete Hegseth, among others, according to Przydacz.
"The doors to further Polish-American cooperation, including in the context of a permanent US military presence in Poland, are open," Przydacz said.
Following the visit, Nawrocki plans to meet with Polish Deputy Prime Minister and Defence Minister Władysław Kosiniak-Kamysz at the presidential palace in Warsaw to discuss the "next steps," Przydacz told reporters.
Trump said in late May that the United States would send an additional 5,000 troops to Poland in light of his "relationship" with the Polish president.
The announcement came a week after the Pentagon halted a planned deployment of 4,000 troops to the country.
(ał/gs)
Source: PAP