Mr Trump has also attacked Mr Trudeau personally, suggesting the Canadian prime minister is "very dishonest and weak" and "acts hurt when called out".
Trump then departed. Trudeau appeared at a news conference and initially struck a celebratory tone, saying, "I'm happy to announce we've released a joint communique by all seven countries".
It's true that Canadian farmers benefit from high tariffs on imported dairy, while many US farmers are facing an existential crisis.
"Fair trade is now to be called fool trade", he added in response to the threat of new tariffs against the US. As Trump had already left the G-7 summit and was on his way to Singapore for his upcoming meeting with North Korean leader Kim Jong Un, Trudeau gave a press conference in which he went to great lengths to not offend Trump.
Mr Trump warned the EU: "If they retaliate they are making a mistake".
The US and its allies have been locked in a bitter dispute of trade tariffs and perceived trade "inequality" for quite some time.
She continued: "In response, the European Union will impose counter-measures". But it's worth asking the question of what toll unleashing a full-scale character assassination - "there's a special place in hell" is pretty strong stuff - on Canada's head of government means for how the USA is perceived in the world.
Trump negotiated in good faith on the communique agreed by the other members of the G7, only to have Trudeau criticize USA policy after he left, Kudlow said.
Kudlow also accused Trudeau of trying to undermine the USA president at a critical time before his summit with the reclusive Kim on Tuesday.
The French president's office said in a statement: "International co-operation can not be dictated by fits of anger and throwaway remarks". The US president noted that he would recommend the G7 leaders to readmit Russian Federation. "It's a one-time shot and I think it's going to work out very well".
"I think the G8 would be better, I think having Russian Federation back in would be a positive thing".
Russian Federation was expelled following Vladimir Putin's annexation of Crimea in 2014, which Mr Trump characterised as "something happened a while ago".
The Prime Minister has been at the forefront of diplomatic efforts to build an alliance against Russian Federation after the Salisbury nerve agent attack on ex-spy Sergei Skripal and his daughter Yulia. "They threw Russian Federation out". In a tweet sent Sunday while en route to Singapore, Trump pointed specifically to Canada's 270% tariff on dairy the origin of his frustrations with Canada. Trump's revocation of support for a joint communique prompted strong reactions from the G7 leaders. He also said the G7 countries had "again" failed to provide any evidence that Russian Federation was behind the poisoning of a former double agent and his daughter in Britain in March.
Asked what Trudeau did that amounted to betrayal, Kudlow criticized the Canadian leader for holding a press conference in which he called US tariffs "insulting".
He added: "The relationship that I've had with the leaders of these countries - I would really rate it, on a scale of zero to 10, I would rate it a 10". We agreed. We compromised on the communique.
Nadal has no 'obsession' to hunt down Federer tally
As he showed in Monday's (NZT) final, Nadal remains indestructible, even when cramp turns his racket hand into an agonising claw. The Austrian's single-handed backhand, like those of Roger Federer and Stan Wawrinka before him, cracked under the strain.