Actually, TSMC has operated a fab in Camas, Washington for many years.

Oh, interesting! Thanks for the correction.

Note that the wafertech/TSMC fab11 only does processes down to 0.16 um.

https://www.wafertech.com/en/foundry/technology.html

I'm not really following the logic... GP said this (TSMC intending to build a factory in US) was bad for US, because China could march into Taiwan and cut off US ability to make chips.

Wouldn't a TSMC plant in US be good? Since US would have the factory on its own soil? What am I missing?

My understanding of the GP is that the current situation with TSMC only in Taiwan is a disaster. So I think they are actually in agreement with you and I that this is (or could be) a good thing.

Ah, got it. I mis-parsed the comment.