He concluded: "Sorry, we can not let our friends, or enemies, take advantage of us on Trade anymore".
Saying Trudeau's statements are "amateurish" and "sophomoric" only "for domestic consumption", Kudlow said it was Trudeau's remarks that had prompted Trump to pull out of the joint communique.
Merkel said the contentious meeting drives home the point she's made for more than a year: that the European Union needs to stand together to increase its clout on the world stage and that the U.S. is a less reliable partner.
A photo released on Twitter by the German government's spokesman Steffen Seibert on June 9, 2018, and taken by the German government's photographer Jesco Denzel, shows US President Donald Trump (right) talking with German Chancellor Angela Merkel (center) and surrounded by other G7 leaders during a meeting of the G7 Summit in La Malbaie, Quebec, Canada.
Peter Navarro, another top counselor, abandoned any semblance of decorum, suggesting "there is a special place in hell" for Trudeau.
Guy Verhofstadt, a former Belgian prime minister who as an MEP now co-ordinates Brexit talks for the European Parliament, mocked Mr Trump's temper and supposed closeness to Russian President Vladimir Putin in a series of tweets.
"We are convinced that a modernization is perfectly possible, we are convinced that common sense will triumph", she said.
Pilot plant demonstrates low-priced conversion of Carbon dioxide into fuel
The new technology suggests a different path to cutting back the carbon dioxide in the air that is causing climate change. Since its components are off the rack, it should be easy to scale up, Oldham said . "That's the design choice we made".
As G7 leaders were scrambling to respond to the latest US U-turn, Emmanuel Macron's office said in a statement: "International co-operation can not be dictated by fits of anger and throwaway remarks".
Trudeau later said he reiterated to Trump that tariffs will harm industries and workers on both sides of the U.S.
For good measure, Trump sent out more tweets the morning of June 8 before his arrival in Quebec - "Canada charges the USA a 270% tariff on Dairy Products!"
In that regard, she pledged to spend more on defense.
And he launched a broadside at Angela Merkel's government, saying: "Germany pays 1% (slowly) of GDP towards North Atlantic Treaty Organisation, while we pay 4% of a MUCH larger GDP". The European Union, he added "should pay much more for Military!"
The US has pushed North Atlantic Treaty Organisation member nations to spend at least 2 percent of their GDP - a benchmark some have been unable to meet.
"We had been talking seriously about key issues, we had reached an agreement and then the way the President withdrew his support, through a tweet, was like a cold and even depressing shower", Merkel told local media.
"On the issue of trade, we have been able to agree on important questions to us", she added, stressing that it was "important to have a commitment to rules-based trade". "Then Justin acts hurt when called out!".
Even so, dialogue with the United States president must continue and global partnerships aren't over, she said.
"The European Union is brutal to the United States..." A series of recent revelations exposed deep problems in the Federal Office for Migration and Refugees, going back several years.