There’s not just a slip of the tongue or a misstatement. Donald Trump has made quite often made the claim that the COVID numbers in the USA are so bad because of out testing. Here is an exact quote from June 15 (2020).
“If you don’t test, you don’t have any cases…If we stopped testing right now, we’d have very few cases if any.”
OK, this is just plain silly — as everyone (well, just about everyone knows). Just because you don’t test doesn’t mean you have no cases, it just means you don’t KNOW about those cases.