At the request of Prime Minister Mateusz Morawiecki, the president also raised the question of Polish-Chinese cooperation in the fight against the coronavirus pandemic, including the possibility of Poland purchasing vaccines produced in China.
Like other EU countries, Poland's vaccination programme has been hampered by delays in deliveries from producers like AstraZeneca and Pfizer.
The MPs, including from the leftist Razem party, wore bright colours and rainbow face masks in contrast to the more sober attire worn by other lawmakers at the event.
In Sunday's first round, Duda is expected to come first with 41.8 percent, according to an exit poll by Ipsos, meaning he would fall short of the majority required for an outright victory.
Duda, a populist Trump ally, is hoping for a pre-election windfall from the meeting while the US president is seeking to show that the pandemic, which has damaged his own re-election chances, is abating.