He is referring to Trump's travel ban. The wall is used figuratively.
The travel ban will absolutely contain the virus.
Biden also whined about the China travel restrictions put in place in January... the restrictions are the reason why we are doing so well. He is an open borders fundamentalist.
We can never be more thankful that Donald Trump is our President than today. With Democrats, it's politics first and country second. If Hillary would have been in charge, there would be no travel restrictions at all. More and more infected people would be entering our country making it much harder on our health personnel to solve this problem.
Actually with Rump it's "ME ME ME" first and country way downlist. That's why we had all that whining about "a hoax", all that trying to play down the gravity of the infection spread, the contradicting of his own health experts, the failure to get tested after multiple exposures, the constant childish yammering about how "we've been doing a great job", the catalystic dive on the DJIA in response to a leaderless wandering idiot who clearly had no idea what he was doing, ALL of that. Which, I hasten to point out, is exactly the continual self-delusional hallucination that the sentient among us have been warning y'all cult zombies about for FIVE YEARS NOW. So Rump couldn't possibly give less of an orange shit about "country" beyond "what's in it for ME". He reminds us of that at every opportunity, literally 24/7.
And you know what, Woodrow Wilson pulled the same shit in
his flu pandemic. Even created a propaganda committee and made criticism of the government illegal, which intimidated the press from talking about it. He got infected himself, lied to the public about it, buried the import of the viral spread, and it wiped out millions, including Rump's own grandfather ---- and yet Rump just the other day professed ignorance that flu could kill people. After it did just that to his own grandfather at the age of 49. Rump didn't even know his own National Security Advisor had dismantled the global health security team that was there
for this purpose, and when asked about it called it a "nasty question" rather than answer it because --- again ---- EGO. Because "ME ME ME AND DID I MENTION, ME". That's the level of wandering self-infatuated cluelessness we're saddled under for what could be ten more months.
That ain't leadership in any sense of the term. That's exactly what we always said it was --- Narcissism. Mental incompetence. Or as a recent Secretary of State put it, "a ******* moron".