Trudeau 'stabbed us in the back': Kudlow

White House economic adviser Larry Kudlow has accused Canada of making "polarising" statements about the United States' trade policy, and says President Donald Trump had to pull out of a joint G7 statement because the Canadian president had "stabbed us in the back".

"He held a press conference and he said the US is insulting. He said that Canada has to stand up for itself. He says that we are the problem with tariffs. The non-factual part of this is - they have enormous tariffs," Kudlow said on CNN's State of the Union.

"Here's the thing," he added. "He really kind of stabbed us in the back."