Of Nato's 29 members, just five meet that target this year: the US, Greece, Estonia, the United Kingdom and Latvia. And he called alliance members "delinquent" on their contributions to NATO's budget.
"But the strength of North Atlantic Treaty Organisation is that despite these differences we've always been able to unite around our core task: to protect and defend each other because we understand we are stronger together than apart". Why are their only 5 out of 29 countries that have met their commitment?
"And let me say that I'm very much looking forward to further extending our exchanges in the future and enhancing them", she added.
Trump's decision to meet Putin was widely regarded as a blow to the prime minister's attempts to isolate Russian Federation following the Salisbury attack in March, even though he had strongly condemned the Kremlin's actions at the time. The pipeline, set to become operational in 2019-2020, will run from Russian Federation to Germany (Ust-Luga to Greifswald) and double the pipeline capacity between the two nations. Russian Federation needs us to help with their economy, something that would be very easy to do, and we need all nations to work together.
After Putin complained that White House officials tried to stop their phone call from happening, Trump told Putin, "Those are stupid people; you shouldn't listen to them", according to NYT via The Hill.
Referring to her own past living in the now defunct East Germany, Ms Merkel added: "I personally experienced how a part of Germany was controlled by the Soviet Union".
Another key takeaway from the first day was President Trump's criticism of Angela Merkel's Germany.More news: Harry, Meghan mobbed by fans on first official visit to Ireland
Germany's energy relationship with Russian Federation has long frustrated Washington and Eastern Europe, who fear that the Nord Stream 2 pipeline that bypasses the Baltic nations and Poland could be used to cut them off from crucial energy supplies.
"I am very happy that today we are united in freedom, the Federal Republic of Germany".
Nato's secretary-general said the primary focus should be on all members reaching the current target of 2%.
The Nord Stream 2 pipeline project, which intentionally skirts Eastern European nations like Poland and Ukraine, has caused many of Germany's allies to bristle, though Berlin has defended it by saying it would be merely one of many sources of natural gas. Asked if they had discussed the pipeline, he said they had, but declined to elaborate.
On the dais, he and May chatted as they stood together, but Trump kept his back toward other leaders, including Merkel.
"But I have to bring it up because I think it's very unfair to our country, it's very unfair to our taxpayer", he said.
Arriving at Nato, Ms Merkel sought to put her countries ties to the western alliance in historical context. According to the recent Commons report, Canada now provides about 6.6 per cent of NATO's common-funded budgets, making it the sixth-largest financial contributor to that budget among the member states.