US President Donald Trump canceled his final press conference in London after the NATO summit, citing the fact that he had held many such events in previous days. Trump went immediately to Washington after not the most successful communication with the allies for himself.

From the final statement of NATO, the deadline has disappeared during which the alliance countries undertake to bring defense expenses to 2% of GDP. In 2014, at the insistence of the United States, a ten -year period was clearly established, and Trump has repeatedly demanded that NATO members increase defense expenses.
A factor could also become a ridicule of other leaders over Trump. France President Emmanuel Macron, British premieres Boris Johnson, Netherlands Mark Rutte and Canada Justin Trudo agreed that Trump communicates too often and for a long time with journalists and delayed partners. “He was late because someone likes to give 40-minute press conferences for any reason,” Trudeau joked about the late Macron.
Trump in response called Trudeau “two -faced”, but a good guy, at the same time accusing Canada of that she underpaying her 2% of the alliance budget.
After the summit, Macron said that the distribution of forces in NATO should change due to a change in the US position. The French President recalled that the United States requires allies to increase expenses, but they reduce their own and at the same time left Syria - the theater of military operations close to Europe. He ironically agreed that this happened for "completely respectful reasons."
https://twitter.com/realdonaldtrump/status/1202232743876161537