He's lying. But do any of his supporters care?
Why is he lying? First of all
there was no need to go into panic mode. And secondly, the epidemic will abate shortly, just as flu abates after a season of flu. If he is telling people to keep calm, that is exactly what a President should be doing at this time!
However, what you failed to point out is that in the early stages of COVID-19, the evil Democrats were spending all their time and energy on trying to impeach Trump, WHEN THERE WERE NO IMPEACHABLE OFFENSES. Indeed McConnell could have thrown those bogus Articles of Impeachment in the trash, since they were actually trash. Instead he opened up the Senate to more Democratic nonsense for days and weeks, when the focus should have been on coronavirus and how to keep America safe (which is of no interest to treasonous Democrats).
So his supporters don't care for your lying, and the lying media, which cannot come up with a single truth under any circumstances. And they never apologize honestly for anything.
Trump has been calling for a border wall ever since he took office.
And the lying Democrats and the Deep State have been resisting, resisting, resisting, day after day. The same goes for deportations of illegals, and the releasing of criminals and gangsters from prisons. Now all of a sudden Mexico wants to shut down its border with the USA. Imagine if there had been no resistance, since this was a national security issue.
Now everyone is shutting down their borders, even in Europe, even in Germany where Merkel has been insisting on open borders and migrant invasion while she destroys Germany. And the Greeks are now putting up concrete blocks and using other means to shut down mass illegal migration from Turkey, since Turkey has weaponized illegals for its own agenda. And the only reason Italy was affected so seriously is because of the Chinese population in Italy.
At the same time, Trump has not had proper advice about a proper wall, therefore what you see are pictures of an inadequate fence. Again, his advisers have been sabotaging his agenda.
A proper solid wall (including a barrier to all tunnels), with all defensive and offensive equipment in place, could have prevented not only illegals, but all kinds of infectious diseases from coming North. Those caravans would have stopped had they seen a real wall in place.