nelsona , I presume that OP is referring to the possibility of a new president taking office who is proposing to make radical changes to the US relationship with at least one NAFTA country. I'd agree with nelsona that you likely can't do this more than 2-3 weeks in advance. 2 weeks in advance should be fine, though, so given that the new president (whoever it turns out to be) won't take office until Jan 20, 2017, it should be possible to renew just before the new president takes office if that is indeed OP's concern.