It probably is under USMCA:

“[T]he 2020 deal allows for national security exceptions”, which is why he’s blathering about the crap he’s blathering about.

See here, article 32.2(b).

In theory, USMCA is a law (his own law…) that has been passed by the US Congress. So in theory, he shouldn’t be able to just tear it up at a whim.

In practice, with US institutions captured by the trumpist republicans, lol yea.

EDIT: also “the 2020 deal allows for national security exceptions”, so that’s why he’s blathering about the crap he’s blathering about. EDIT2: Here, article 32.2.

Or you know, allow free movement if people wherever free movement of capital and commodities is allowed. An American Schengen if you will.