“The question here’s “how to do it?”. “
A starting point is to require future trade agreements to impose reciprocity in the terms. Current trade agreements allow foreign access to our markets while denying access to their markets.
Saying it's one-way is easy and they'll probably say anything Trump signs is 'one-way' too. Useless.
Writing the doc is hard. Existing agreements are public record (NAFTA text here) so please tell us which section makes it one way in your view and please say what you want to be different.