Hours earlier, he criticised the Canadian Prime Minister Justin Trudeau for "being so indignant" at the imposition of United States tariffs, and railed against French President Emmanuel Macron for his alliance with Trudeau.
Many U.S. lawmakers, both Republicans and Democrats, have also expressed concern about Trump's departure from past U.S. views on trade, Russia, and the worldwide order.
The Canadian Prime Minister's office, however, noted that Trudeau said nothing he has not said before either in public, or in private conversations with Trump.
"Canadians, we're polite, we're reasonable, but we also will not be pushed around", Trudeau said.More news: Kim summit: South Koreans hold little hope of success
"It's going to change", said Trump.
Heading into the leaders' summit in the town of La Malbaie, there were deep concerns the G7 alliance was fast becoming a G6 plus one because of a widening gulf between the USA and the rest of the group in key areas such as climate and trade.
"I don't know if they were surprised with President Trump's free trade proclamation, but they certainly listened to it and we had lengthy discussions about that", Kudlow said at the press conference. "Canada can't believe they got away with it", Mr. Trump said.
Fox Business contributors James Freeman and Kristina Partsinevelos discuss President Trump's upcoming meeting with North Korean Leader Kim Jong Un and the president's recently imposed tariffs. I said okay, but so far we're getting nothing.
Trade experts who have watched Trump negotiate with tough words on Twitter before said the bark of Trump's tweets often exceeds the bite of his policy - but that this time, Canada might struggle to respond.
But unanimous agreement by all G7 leaders on two big environmental issues at the 2018 summit eluded Trudeau, hosting the club of advanced industrialized nations for the first time amid tensions stirred by Trump.More news: ‘Unravel 2’ Announced at EA Play, Releasing Now
"We are focused on everything we accomplished here at the G7 summit", the statement, released by Cameron Ahmad, said.
"It allowed a dialogue, where for weeks there were uncoordinated unilateral actions and non-cooperation". Russian Foreign Minister Sergey Lavrov also said that the G20 is more "perspective format", while his deputy Sergei Ryabkov noted that the G7 was losing its importance, especially given promising alternatives, such as the G20 and BRICS.
Trump says his tariffs are meant to protect US industry and workers from unfair global competition as part of his "America First" agenda. "It's a attractive evening, a great weekend".
The government announced it would impose more than $16.6-billion in retaliatory tariffs, effective July 1, on a variety of USA goods. China has vowed to retaliate in equal measure. He called many current tariffs on USA goods and services "ridiculous". President Donald Trump's move to slap tariffs on steel and aluminum imports and tear up a nuclear deal with Iran.
They also supported the United Kingdom's accusations against Moscow of nerve agent attack in the city of Salisbury.
The US had imposed hefty tariffs on steel and aluminium imports from key allies the Europe Union, Canada and Mexico last week.More news: UN slaps sanctions on six human traffickers in Libya
- Oil Falls on US Crude Build; Global Supply Rises
- Redmond O'Neal, son of Farrah Fawcett, charged with attempted murder
- US has developed a new plan for the defense of Europe
- Justin Trudeau: We won't be pushed around by Trump
- Gavin Patterson is out as BT CEO
- Command & Conquer: Rivals takes the strategy series to mobile
- Medicare to be exhausted by 2026, three years earlier than expected
- Ricciardo: Mercedes will be hard to beat
- No expectation within Heat organization that LeBron James will return
- Priyanka Chopra Apologizes for Recent Quantico Episode Featuring Indian Terrorists