Trump just needs to pay for buses to bring the Mexican illegals to the Canadian border. Not even a fence. The moment they walk across the 49th they will be entitled to no cost (for them) education, health care, housing, welfare cheques. Castro-China loving Trudeau will welcome them with open arms. A win-win for America and the illegals.
Take away their jobs. Take away the freebies. Let them pay for the bus ride home. Either that or they can get out the way they got in. They can walk sneakily to and across the border.