I stand corrected it was Trudeau. Below is a URL to a site putting the statement in historical perspective. I am glad I read it. It makes me grateful for the state of the world today compared to then. Oil Embargos. Vietnam war. Unfriendly relations between Canada and the US.

Nixon was corrected for claiming that Japan was the USA's biggest trading partner. Maybe it is inevitable that the USA takes Canada for granted. But there are worse things

Thank you GUEST.

http://www.dfait-maeci.gc.ca/hist/canada9-e.asp#elephant