Again, why was Trump in a bidding war with state governments for these supplies if obtaining them is the purview of the states?
The federal government has emergency response duties also, for military and federal law enforcement, Congress, and critical branches. And as a reserve stockpile to allocate as needed.
He was right; the states should not be mewling kittens bawling for the Fed to do their job for them. Get off your ass and try to source supplies, many that you should have already had, and THEN if you have a problem, we'll work together. States acquired a lot on their own and where they crossed procurement paths with the Fed, worked out the needs and logistics.
Okay, answered your question and mine regarding supplies.
CDC received the virus genome info on Jan 11/12, developed a kit and identified the first U.S. case on Jan 21. We had one of the earliest test protocols in the world.
It's been reported by every outlet on the planet by now that after developing the test used to identify the first U.S. case on Jan 21, and shipping kits on Feb 5 - the same timeframe as any other first world nation - that the test failed in the field and CDC spent the rest of Feb trying to identify and fix the problem. This was the most critical failing in the entire pandemic saga. If reporting is correct, FDA visited the CDC lab Feb 23. The outcome, at minimum, is that FDA found evidence of contamination and process deficiencies, resulting in the FDA official screaming at CDC officials across the table "if they were a commercial lab, he'd shut their asses down". States were still asking for and expecting replacement kits Feb 29.
Trump was meeting with industry leaders, FDA removed the exclusive test development EAU they'd granted CDC at their insistence, and opened the gates to a number of commercial and government labs. No later than Mar 10, testing was being conducted by some of these labs and in a two week span ending March, we conducted approx. 1.5 million tests.