Some companies already have policies to NOT allow any US personal data to be viewed, or accessed by any non-US employee regardless of whether they are employed by a US based company or not. There’s even a growing HR push in this regards. Some HR companies keep your HR data stateside ONLY and while they may hire nonUS employees, they are in roles to where they don’t have access to US personal data.
Now, before congress, this very thing is on the table for discussion and seems to be meeting little opposition.