Earlier quoted context omitted.
Supply chain integrity is a huge, possibly unsolvable problem. One of the arguments for domestic manufacture of at least some keystone parts, and one of the reasons IBM is still in the fab business.
Since those who say "domestic" usually mean USA, I'm guessing you live there. Bad news: your government is one of the attackers. (So is mine, unfortunately.) I take it you've seen the NSA interdiction guys taking discreet hacksaws to Cisco parcels en route to 'implant' (backdoor) them by now? Did you think that was something that only happens abroad?
That is, they snoop on you, yes. But they don't sell you shoddy knock-offs instead of real parts, they don't give intel on you to your competitors, and they don't actually attack you Stuxnet-style. (that I know of)
I could be way off base, but as a US company I'd much prefer a US gov't backdoor to a Chinese gov't backdoor, and supply chains contaminated by knock-offs is a nightmare unto itself.
P.S. Yes, I'm in the US, and yes, you're right about "domestic"
P.P.S. IBM's fab (to my knowledge) mostly exists to serve the US gov't anyway. At least for the NSA themselves, the advantages to domestic production are there :)