The government thinks our salaries are too high
Personally, I think people underestimate the unique talent in the west coast of the US, so wages will not be immediately depressed - but it is clear that this is a move premised on the idea that we have to lower the salaries of technical workers in the US.
I frankly don't care if we are #1 all that much and certainly am not willing to forgo hundreds of thousands of dollars just to placate some "national security leader"'s insecurity around maintaining American exceptionalism.