Rather than sending a tweet that implicitly attacked Trump when the temporary immigration ban was announced Trudeau should have issued a careful policy statement talking about possible repercussions for Canada and how we would deal with them. This was one of them. His cavalier attitude risks derailing the Beyond the Border and Regulatory Co-operation Council initiatives set up by Harper and Obama in 2011. Perhaps that is Trudeau's object. He doesn't seem to want to leave anything around that Harper could claim as a legacy, however beneficial it might be to Canadians.