Probably because there's absolutely no reason to do so? It's not like the US has a shortage of labs that can produce these kits. Supposedly, the problem was tha

Probably because there's absolutely no reason to do so? It's not like the US has a shortage of labs that can produce these kits. Supposedly, the problem was that the CDC lab tasked with mass producing the testing kits wasn't competent to do so and didn't realise it - if the government had known what the problem was, they could've contracted production out to another US lab sooner. With the benefit of hindsight we of course know that getting kits from somewhere else would've been better, but imagine how much harder this problem would be to diagnose if the kits were sourced from some foreign lab the FDA didn't have access to.