Right, Stephen Harper is concerned. But what if it came to light that Canada was willing to make concessions in order to keep NAFTA in some form. The Harperoids would be screaming that the JT government is not being tough enough or not negotiating aggressively.
Which is exactly what they were saying when the notion of renegotiating NAFTA began to form. "Trump is a brilliant negotiator so the Trudeau liberals will get crushed at the table." Now they want concessions.
FYI Harper lovers, Republicans in Congress are examining how to block Donald Trump from pulling out of NAFTA by warning him that any such move could put tax cuts at risk.