That is because Duda is a politician and Trump is not nor has he ever admitted to being one.
Basically, president Duda is a puppet in the hands of the real Polish leader Mr Jarosław Kaczyński. Having realized he would never get sufficient popularity among voters to win any election, Mr Kaczyński had made a brilliant step indeed towards a winning of the 2016 presidential election by a PiS candidate. Chairman Kaczyński had put forward and succeded in the promotion of a new face - a canditate that was totally unknown to the public, but one who was skilful enough to win the election or could have got a good result in it which wouldn't have been insignificant for PiS. Some years before that election, Mr. Duda lost the election for a councillor in Kraków. Without party leader Jarosław Kaczyński promoting him for the post of President, Duda would have remained an unknown party functionary somewhere in Kraków to this very day.
Mr Kaczyński repeated this brilliant move in the parliamentary ellection that followed suit. In this election he put forward Beata Szydło, also an unknown politician, for the post of Prime Minister in the future government. Likewise, she also lived up to the expectations of the party leader and had a big share in winning the election whose result would certainly not have been so good if Mr. Kaczyński had declared his wish to become Prime Minister in the future government himself due to his unpopularity among the general public.
Such are the meanders of Polish politics of which you have probably been not aware of, Johnny.