Merkel tried to play down tensions with Trump ahead of the G-20 meeting.
And Trump's responses seem to have gotten tougher with each test. Take his first public response as president - it was just one sentence. In the past, Poland has been under the control of Tsarist Russia and the Union of Soviet Socialist Republics and has faced an uphill battle to get USA and North Atlantic Treaty Organisation troops to enter and protect Polish soil from nearby Russian forces.
"And President Trump, to his credit, even said we have to be wary of threats from the south and from the east".
Trump told the crowd - which consisted in part of people who had reportedly been bussed in from the more conservative countryside - that the west's fight against "radical Islamic terrorism" was necessary to protect "our civilization and our way of life".
Ivanka Trump visited the Jewish ghetto of Warsaw without her father
Trump is next headed for Hamburg, Germany, where he will attend the G20 summit.
During the speech at Krasinskich Square, which wound up Trump's visit to Poland, he stated that Poland and the United States stand side-by-side in mutual defense commitment.
Polish President Andrzej Duda, who has had his own experiences with unfavorable news coverage, nodded in agreement.
Trump also announced new measures to work with Poland, specifically to address Russia's "destabilizing behavior".
At a news conference earlier with his Polish counterpart, Trump said he believes Russian Federation may have tried to interfere in the 2016 U.S. election, but said others may have been involved. Trump later announced his support for Article 5. Poland and its neighbors see Trump's arrival as a strong signal that Russia's gas monopoly over the region could be broken. "Let them come to Poland, and let them come here to Warsaw and learn the story of the Warsaw Uprising". The country's Law and Justice Party has embraced some of the main pillars of Trump's candidacy, including a similar resistance to accepting Muslim refugees into their country.
Dawson in Lord's Test XI
South Africa have a really good record in England and are a very risky team... It's a really huge opportunity for him and I am sure it's one he will take'.
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