All this is humongously backfiring for Trump. If you look at pretty much every nation, unpopular leaders are getting a huge popularity boost due to the coronavirus, the whole war-time president effect. But not Trump.
That's because he's doing it all wrong. People want to know the adults are in charge during a crisis.
EDIT: All he needed to do was some "we'll get through this together" speeches and then hand it off to the health officials to give the advice while he shuts up and gets off stage. But instead first he hands it off to Pence, then he spends the rest of the time constantly saying how it's nothing to do with him and nothing is his fault.
Trump's core strategies of distract and divide don't work when there's an ongoing crisis out of his control. Trump's basic advantage is how he short circuits the
OODA Loop (observe–orient–decide–act) of his rivals, which is a military concept about the turn-around time in competitive decision making. If you can get your turnaround in reacting to changes in events fast enough, you can disrupt the decision-making of the enemy (since by the time they've made a new plan, you've changed the situation already), which becomes a huge advantage.
Therefore, by the time you've sorted out your response to the previous thing Trump did or said, Trump has already moved on to doing something even crazier than you need to respond to, rendering your previous response invalid. Trump acts, you
react. However, the pandemic is like a law of nature, pushing Trump into pure reaction mode, but he's still trying to "beat" the coronavirus by engineering new crises of his own that push him back into the limelight, such as announcing the WHO de-funding. I'm pretty sure that Trump is just jealous of coronavirus getting all that airtime.