This is a potent narrative.
In Brussels, the USA ambassador to NATO, Kay Bailey Hutchison, defended the summit meeting - and unlike Trump criticized a series of Russian actions she called 'malign'.
Trump also took aim at what he indicated were trade inequities with the EU on Monday in an indication he will attempt to link the US commitment to European security with trade.
To her critics, May is forever making compromises to carry out Brexit, even though she herself voted against leaving the European bloc.
Trump loathes Germany's trade imbalance with the United States and feels the country is free-riding off the US security umbrella.
And pulling out won't have much support in his administration or among lawmakers. This was years before Russian Federation seized Crimea.
Experts fear the trip could produce a repeat of the dynamics from Trump's last trip overseas, when he admonished G-7 allied nations at a summit in Canada before heading to Singapore, where he showered praise on one of America's longest-standing adversaries, North Korea's Kim Jong-un. Separately, doubts about Trump's commitment to European security have pushed EU leaders to boost defense cooperation. The Europeans abhor Trump's decision to impose steel and aluminum tariffs on a part of the world that is supposed to be the United States' partner.
Mr Trump has repeatedly expressed his anger some European countries, the United Kingdom excepted, do not spend at least two per cent of GDP on defence.
As he left the White House to travel to Europe on Tuesday morning, President Donald Trump had more harsh words for the multi-country military alliance that was has been a punching bag throughout his campaign and into his presidency. And, dear Europe, spend more on your defence, because everyone respects an ally that is well-prepared and equipped.
Since moving into the White House nearly 18 months ago, the US president has been as abrasive with some of America's most trusted allies as he has been warm toward traditional adversaries like North Korea and Russian Federation. Pearl Harbor ended U.S. isolation, while 9/11 ended for all time America's insulation.
Jans said it is vital to discuss not just how much countries are spending but if they are doing so in a way that makes them able to work together. It would also have to be fully backed by Congress and the U.S. private and non-governmental sectors across the board.
Asked about Trump's remark that the UK was "in turmoil", the Prime Minister's official spokesman said: "The Prime Minister looks forward to showing Donald Trump the UK and talking to Donald Trump about the UK and is confident that he will leave with a very positive view".
With his escalating complaints that the United States contributes more than its fair share to defense, and vague threats to countries that do not spend more, Trump is diluting the alliance's appearance of unity, say diplomats and analysts.
While departing on Monday, Mr. Trump said his meeting with the Russian leader "may be the easiest" of all his meetings this week in Europe. Trump also said that it was in Washington's interest to foster better relations with Moscow and Beijing.
How can Trump harm North Atlantic Treaty Organisation? At Brussels, that means trying to minimize uncertainties generated by Trump's untamed rhetoric and quixotic behavior. This is especially valued now, given their own deep internal divisions, which are magnified by the rot in democratic practice in some countries and the damage being done to security and the future of the European Union and Western security caused by Brexit. We sincerely hope he provides those reassurances.