Some time ago, American gulf refineries spent considerable money to retrofit for the processing of heavy oil and to go back would be expensive.  Heavy oil from the oil sands would displace off shore oil such as from OPEC.  President Trump doesn't want off shore oil and these refineries don't want fracked light oil.  Jobs for American workers at no government cost is ideal for him and if he can approve it so that it looks like the USA is a winner, (America first) he should be eager to go for it.  Sure some are going to challenge it and other activities like the Dakota pipeline but I believe that the majority of Americans will get on board with their President and it will be to Canada's benefit.  Good luck TRP.