I read another article saying the US decided to make their own, and that in itself wasn't an issue. It stated the US has some of the brighest folks working on these things an can usually come up with something even better.
But in this case, we completely failed. We had some kits that were allegedly contaminated. We're still wayyyyyyy behind on the # of kits needed to ensure everyone who has any symptoms or has had any contact with anyone infected like we need to.
If we had that, we'd be in a much better place. LIke I said in my first post, I'm not sure if it was Trump specifically who made the call to not use the WHO's kits, but his actions up until the past 3 days have really got us behind the times here.