US President Donald Trump threatened to send 25 million Mexican immigrants to Japan, according to the Wall Street Journal report on Friday.
The G7 summit failed after Trump abruptly withdrew from its final statement and launched a strong attack on Canadian Prime Minister Justin Trudeau.
The Wall Street Journal cited European officials who were behind the scenes, saying that Trump's counterparts were resentful of statements he made about trade, terrorism and immigration.
«I do not have this problem, but I can send you 25 million Mexicans and you will be out of your office very soon», Trump said, according to a European immigration official.
The source added that when the subject turned to terrorism, Trump told French President Emmanuel Macron: «You must know about this (the issue), Emmanuel, because all the terrorists are in Paris».
European Commission President Jean-Claude Juncker also criticized Trump, whom he has repeatedly described as a «savage killer», referring to the EU imposing fines on antitrust issues and taxes on US technology companies.