US President Donald Trump has thrown two days of diplomatic talks into chaos, insulting Canada's Prime Minister and tweeting that the United States would not endorse the joint communique that leaders from the Group of Seven nations negotiated at this weekend's summit.
Trump called Trudeau "very dishonest and weak" on Twitter on Saturday and then sent Kudlow and trade adviser Peter Navarro to hammer the message home on Sunday morning news shows in an extraordinary assault on a close USA ally and neighbor. The move has since angered leaders in Europe, Canada and Mexico and has prompted retaliatory threats on U.S. goods.
"Very dishonest [and] weak", Trump tweeted.
The remarks, following a two-day meeting in Canada with the world's largest industrialized economies, seemingly worsened diplomacy between the USA and its closest allies during heightened tensions about US tariffs on aluminum and steel.
Trump's tweets taking aim at the leader of a country that has always been a USA ally came after the President left the G7 summit in Canada to travel to Singapore ahead of a planned diplomatic meeting with North Korean Leader Kim Jong Un. His negotiators have demanded the dismantlement of Canada's openly dirigiste system of supply management in agriculture - a complicated nexus of production quotas and import tariffs created to ensure Canadian dairy, egg and poultry farmers receive fair prices for their products.
Soon after the joint statement was announced, the USA president tweeted defiantly about not allowing "other countries to impose massive tariffs and trade barriers on its on farmers, workers and companies".
Trump quickly responded on Twitter that he was surprised by Trudeau's comments because he found the prime minister "so meek and mild" at the summit.
While talking tough with USA allies such as Canada and the EU, Trump repeated his call for Russian Federation to be allowed back into the elite club, which includes Britain, Canada, France, Germany, Italy, the US and Japan.
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.
Mr Trump warned the EU: "If they retaliate they are making a mistake".
He added: "Canadians are polite, we're reasonable but we also will not be pushed around".
He said Trump "did the courtesy to Justin Trudeau to travel up to Quebec for that summit".
"In response, the European Union will impose counter-measures". Copies that begin "We, the Leaders of the G7." were distributed in the press room stamped "Approved".
"The prime minister and the president had a very positive, productive meeting and it lasted longer than originally scheduled", a senior government official, speaking on background, told reporters assembled at the G7 summit Friday.
The U.S. president did not appear to be listening during some of the trade presentations, another G7 official familiar with the meeting said.
Trump said that would be a bad idea.
The US president repeated his call for Vladimir Putin to join the other leaders around the summit table.
British Prime Minister Theresa May said the other G7 leaders registered their "deep disappointment at the unjustified decision by the U.S." on its closest allies. "And I saw the willingness on all the sides to find agreements and have a win-win approach for our people, our workers, and our middle classes".
The American leader said a three-country deal would only be possible with substantial changes, and reiterated his interest instead in forming separate two-way trade accords with Mexico and Canada - an interest Canada has made clear it does not share.
But despite the rows over trade and Russia, Mr Trump rated his relationship with other G7 leaders as 10 out of 10.