Booom! That’s a game changer!
No, not really.
Rare Earth metals are not rare. They’re everywhere. We have several mines, shut down at the moment due to Chinese dumping.
If the US political system really wanted to hurt China, this is where to do it. Slap a 200% tariff on anything with a rare earth in it that comes from China. The mines would reopen the next day and China would really hurt.