Admiral Beez
Superstar
It did happen. The US refused to allow Britain or France to sell nuclear submarines to Canada.If Trump blocked military sales to Canada, he would be in essence declaring Canada an enemy nation. You only block military sales to your enemies. If that ever-happened Canada.....
"Under the 1958 US–UK Mutual Defence Agreement, the US had the right to block the sale of submarine nuclear reactors by the United Kingdom to any third party (i.e. Canada), and under a 1959 agreement between the US and Canada the US had the right to block the purchase of submarine nuclear reactors by Canada from any third party (i.e. the United Kingdom or France)."