In the letter, released by Ottawa, ambassador David MacNaughton said Canada's dairy industry was less protectionist than its USA counterpart.
Dairy industries organizations in Australia and New Zealand said Wednesday that they would support the US if it took the dairy dispute to the World Trade Organization, following Trump's declaration that existing rules are unfair, the Financial Post reported.
Speaking at an event in Wisconsin Tuesday, Trump said Canadian dairy farmers are in America's fair-trade sights.
"Dairy trade between Canada and the U.S.is important and the sectoral trade balance massively favours the US, at around 5 to 1", he wrote in a letter to New York Governor Andrew Cuomo and Wisconsin Governor Scott Walker this week.
"We're also going to stand up for our dairy farmers in Wisconsin", he said.
At issue is a U.S-Canada dispute over what's called "ultra-filtered milk", a protein liquid concentrate used to make cheese, the Milwaukee Journal Sentinel reported (http://bit.ly/2nLyUNC ).
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Dykstra said the USA has increased its dairy exports to Canada by 17 per cent over the last few years.
Despite the tough talk, he said the relationship with the new Trump administration has been extremely positive, and his office will continue to work on finding solutions to disputes.
"There are a lot of time when it is easier to blame somebody else then it is to deal with the market situation", MacNaughton said of Cuomo and Walker.
"Together with other dairy exporting countries, including the USA, we have questioned these policies at WTO Committee on Agriculture meetings in Geneva as recently as last month", McClay said.
Bernier says Canadians suffer more under supply management than Americans and if elected leader he promises to abolish the system.
"There's always going to be irritants". "We can't wait and make this part of a long NAFTA negotiation".
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"I'm not saying we'll have another great depression, but this is surely not going to be helpful to economic growth and to prosperity in the world".
Mr MacNaughton instead laid the blame at the feet of "US and global overproduction" and the hard "global situation" of low world dairy prices, which is a problem faced by farmers on both sides of the border.
The two senators joined U.S. Sen.
Governor Scott Walker is urging President Trump to address Canada's dairy trade restrictions.
Relations with the USA are crucial as more than 75 percent of Canada's exports go to the US, while 18 percent of US exports go to Canada.
It also harkens back to the USA election campaign trail, when Trump regularly lashed out at specific industries, and even individual companies, and decried NAFTA as one of the worst deals ever made. NAFTA has been very, very bad for our country.
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"We didn't think they would go through with it, at the end of the day it was just a campaign promise", Schumer said.