Trump rhetorically implies all sort of threats to NAFTA and Lawrence Herman (a) suggests that Canada beat him to the punch by withdrawing, and (b) blandly suggests that Mexico is on its own and Canada should simply get out of the way in the upcoming US-Mexico trade dispute.  This is bad advice.

The reality is that the US has not made concrete demands upon Canada or any other nation as yet, that the US would be in no mood to negotiate a new trade deal with Canada from scratch at this time on equitable terms, and that the Trump Administration will shortly have all manner of domestic and foreign issues (many of its own making) to deal with.  

We should stand by our friends, refuse to be panicked or bullied, be calm reasonable and prepared to make our case including counter demands, and generally not fall for the negotiating tricks of a sometimes shady real estate developer.