Its rather hard to actually pick one manufacturer who doesn't build in China these days. Its downright impossible to build any electronic product without some part being constructed in a Chinese factory at some point. From what I've seen and read of Shenzhen, its quite remarkable achievement though personally, a sad state its been allowed to become dominant because of cost. Getting a touch political there....
It's definitely based on the xenophobia with the US government in any foreign company having a large market to themselves at the expense of US ones. Doesn't matter which country it is, if its going to be a competitor to the US one, there will be an angle to leverage against it. Easy to blame that way and no doubt funded by the unseen politcal lobbyers with all the money to influence who have got money by er, outsourcing overseas.
I also think they've been caught out by encouraging IT manufacturers to outsource overseas where the supply chain will be harder to compromise. You should look up "Cisco and CIA intercepts" to understand the lengths government sponsored spying goes to. And not just the USA but again, pointing the finger at the other ones distracts the real motive.
Not that I'm saying there isn't a concern but at a consumer level, you're relatively safe with the big manufacturers rather than the cheaper ebay specials that are prone to spyware/malware pre-loaded as if you think about it, there is no real benefit long term as consumer items have a faster churn rate than say a data centre full of networking equipment and the corporate/government information is far more useful.
