covid 19 – Can American mother living in France bring French father with her to the US right now?

I live in the US. My parents want to come and visit me. My mother now has dual citizenship France/US (born and raised in US, moved to France later). My father is only French.

My mother believes right now that she’s not even allowed by herself back to the US because she lives in France. It sounds crazy to me, but is it true?

I know France right now would allow the reverse situation (French citizen allowed to bring US spouse to France just on the basis of their being married), but I’m not sure whether the other way around (title question) is true.

If you don’t know, do you have any idea where I could call and find out?