"I have some pretty severe things that we're thinking about", he told reporters in Poland, where he was making an official visit ahead of the G-20 summit in Hamburg, Germany, on Friday. The incident took place during his Poland visit when the First Lady of Poland declined to shake hands with him and chose to greet the FLOTUS instead. The couple was greeted by US Ambassador to Poland Paul Jones and Poland's Foreign Minister Witold Waszczykowski, as well as Minister of State Krzysktof Szczerski.
Watch out, Poland - you may have just upset the one President petty enough to start a war over a handshake! Trump's arrival was no exception.
Prior to the speech, Trump laid flowers at the monument, which memorializes the fight Poles and, in particular, Polish Jews waged against their Nazis occupiers as they began emptying a massive Jewish ghetto to concentration camps constructed in the Polish countryside.
Mr Trump praised his hosts for honouring their spending commitment to North Atlantic Treaty Organisation, saying: "The example you set is truly magnificent".
"Both Kaczynski and Trump perceive themselves as those who can stop this liberal-left political correctness offensive in the world", Michal Szuldrzynski, a columnist for Rzeczpospolita, an influential centre-right newspaper, explained to the BBC. "I won't be specific", Trump said at a news conference in Warsaw with Duda.
The Polish president stressed the issue is under the framework of Three Seas Initiative - an alliance of a dozen eastern and central European nations that border the Adriatic, Baltic and Black seas.
Trump was in Warsaw on Thursday to attend a meeting of the Three Seas Initiative, a project started a year ago that aims to strengthen trade, infrastructure, energy and political co-operation among 12 countries bordering the Adriatic, the Baltic and the Black Sea. The two issues are really one in the same since Poland is still dependent on Russian Federation for oil and gas.