Well, war of words, anyway.
I still can't imagine why the US, embroiled with almost every other nation, would choose this moment to get tough on Canada.
Relations between the two neighbouring countries suffered after Canada refused to support the US-led invasion of Iraq in 2003.
Last week, Mr Martin lambasted Washington over its decision not to join the global effort to combat climate change.
After calling on Canadian politicians to calm the rhetoric, the American ambassador [Wilkins] said: "Canada never has to tear the US down to build itself up."
Although Mr Wilkins did not mention Mr Martin by name, he suggested he was irked by his criticism of the US at the climate-change conference in Montreal last week.
But the Canadian PM said he was not trying to score political points by slamming the US but had every right to speak out in favour of his country's interests.
"I am not going to be dictated to as to the subjects I should raise," he told reporters.
The whole world was infuriated by Bushco's performance on the environmental conference
, which included trying to blackmail the conference into not listening to Bill Clinton. But for some reason, the US Ambassador felt he had to remark on Canada's
There really are times when it is best to hold one's tongue and be thought a fool than to open it and remove all doubt. Wilkins, I think, removed all doubt.