Trump is scheduled to meet with Polish President Andrzej Duda Thursday, as well as with the heads of a dozen countries bordered by the Baltic, Adriatic and Black seas known as the Three Seas Initiative.
"Because as the Polish experience reminds us - the defence of the West ultimately rests not only on means but also on the will of its people to prevail", Mr Trump may say, according to excerpts released from the speech.
"America stands ready to help Poland and other European nations diversify their energy supplies, so that you can never be held hostage to a single supplier", Trump said in Warsaw, Poland, where he attended a meeting of 12 European nations.
Energy Secretary Rick Perry went so far last week as to say the US could make up for the animosity generated by exiting the Paris Agreement by providing cheap natural gas to other countries. I don't like to talk about what I have planned, but I have some pretty severe things that we are thinking about.
By the time French President Emmanuel Macron met with Mr Trump, the French leader was clearly not going to let his U.S. counterpart emerge the victor from a white-knuckled grip.
Watson through to Wimbledon third round
She said: "Personally, I can't speak for anybody else, but if my leg was broken I'd be crawling to the next ball". Heather Watson won 6-0 6-4 against Anastasija Sevastova at Wimbledon on 5 July 2017.
The event presaged the 1944 Warsaw Uprising, a larger citywide revolt and the subject of the monument near which Trump gave his speech Thursday.
"Our citizens did not win freedom together, did not survive horrors together, did not face down evil together, only to lose our freedom to a lack of pride and confidence in our values", Trump said.
This Trump handshake fail is the best one yet.
Trump will also issue a Reaganesque call to tackle bureaucratic over control, which he will frame as more than just an inconvenience or byproduct of a rules-based society.
Trump announced in May that he would pull the United States from the Paris Climate Agreement, a global accord on fighting climate change.
Wow. I listened to a lot of Barack Obama's speeches, with all the empty platitudes about how we all can get along, even as the planet caught fire and burned while he sat back and dithered. The scandal continues to eat away at his administration, with key White House staff being forced to hire their own lawyers and spend time rebuffing new allegations.