"On the issue of [tariffs and trade deficits] alone, we have allies strategically, but when it comes to trade disputes, these allies are basically robbing us blind", he said. "The withdrawal by tweet is, of course, sobering and a bit depressing as well", she told Germany's Anne Will talk show on Sunday evening.
In a lengthy press conference ahead of his departure on Saturday, Trump said he spoke to world leaders about trade policies and called for the elimination of tariffs, trade barriers or subsidies.
The 42-year-old concluded his remarks with a warning shot to President Trump: "Canadians are polite, we're reasonable, but we also will not be pushed around".
Trump's tirade came before he was to leave for Singapore for his historic summit with the North Korean leader North Korea's Kim Jong Un.
Trump threatened that the U.S. will stop trading with countries that maintain tariffs on his country's exports, particularly in the agricultural sector, and that he has launched the idea of eliminating all trade duties, because "ultimately that's what you want".
Later on Saturday, after Canadian Prime Minister Justin Trudeau said all seven nations had signed a joint communique at the end of the summit, Trump angrily lashed out on Twitter, stating the USA would not endorse the statement.More news: How the US-North Korea summit will move the markets
Trump was last to arrive for the G7 working breakfast, walking into the room when the summit's host, Canadian Prime Minister Justin Trudeau, had almost finished his welcome and presentation speech, Efe reported.
She also spoke about Trump's suggestion that Russian Federation be readmitted to the G-7, from which it was booted after its annexation of Crimea from Ukraine in 2014.
Trudeau says five of the G7 countries agreed to a plastics charter to further protect the environment and oceans. "It's going to stop or we'll stop trading with them", he said.
But California Sen. Dianne Feinstein, a Democrat, said Trump wasn't just taking on Trudeau, but all of the United States' best allies by not signing the G-7 statement after a two-day meeting in Canada with leaders of the world's largest industrialized economies.
One U.S. official told Breitbart News Economics and Finance Editor John Carney that world leaders were mistaken if they believed President Trump would soften his position on tariffs.
"The continuation of sanctions is clearly linked to Russia's failure to demonstrate complete implementation of its commitments in the Minsk Agreements and respect for Ukraine's sovereignty", it said. Across a narrow table, German Chancellor Angela Merkel and French President Emmanuel Macron are standing, holding copies of a draft text, arguing for their position.