Because the question was based on a lie. The Feds did way more than anyone would have expected under any other administration. Meanwhile, the Democrats were crying about racism over closing borders.
Pathetic.
HERES THE FACTS:
This virus landed here on Jan 15th. Meanwhile, the day before on the 14th, here's what the WHO said about it. The patient didn't go to the doctor until the 19th. Diagnosed the 20th/21st
If testing was the answer, nobody in the world was doing testing until early/mid February. This virus had weeks to spread here before anybody had any idea what was going on, mostly because China lied and the WHO repeated their lie. Weeks before anybody could even test for it.
So, explain how you could have stopped it.