Trump closes southern border with Mexico to nonessential travel

Coronavirus response team member Dr. Anthony Fauci declared that a malaria drug has not yet been proven to help fight the coronavirus.
3:23 | 03/21/20

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Transcript for Trump closes southern border with Mexico to nonessential travel
President trump is closing the southern border with Mexico to nonessential travel to stop what he claims is the danger of viral spread from undocumented immigrants. One of the nation's leading experts on pandemic doctor Anthony found she supports the measure saying there's a fundamental health reason for doing that. He also push back on some of the president's comments on possible treatments for the virus ABC's senior White House correspondent Cecilia Vega has more. 24 hours after president trumped it. Third a malaria drug would be made available almost immediately to help treat corona virus doctor Anthony strategy declared the drug has not actually been proven to help. Is there any evidence to suggest that as what malaria it might be used as a prophylaxis against. Should not get the answer is is no end and the the evidence that you're talking about John is anecdotal evidence. But president truck pushed on. Leading to a rare public rebuke by the nation's foremost expert on infectious diseases. May work may network. I feel good about it still is just a feeling as you know Smart guy you know the expression. What the hell you have to lose so I've been right. A life. Let's see what happens I would like doctor charge if you don't mind to follow up on what the president is saying should Americans have hoping this drug right now. The president feels optimistic about something is feeling about it. It might be affected but as a scientist. As we getting it out there. We need to do it in the way says while we are making it available for people who might want to hope that it might work you'll also collecting. Data that will ultimately show that it is truly effective. And safe under the conditions. Of Covert nineteen fundamentally I think it probably is going to be safe. But I like to prove things first. Cecilia Vega joins us now from Washington Sicilian just a few months ago we found out that a member of the vice president's office tested positive for corona virus. Yeah Ellen Davis is breaking news it just came in right now as you said from the vice president's office this is a member of his team this is not someone at their identifying this point in. And right now the vice president's office will only say that neither the president nor the vice president had close contact with his -- dent unidentified person. But they do say that they're now I'm going back to Trace steps in find out who this person it exactly who this person had contact with here. This is sillier things got a bit heeding the in the briefing room today the president clearly unhappy with questions about the administration's track record on corona virus he's saying that he's not getting enough credit. Yeah you know I have to say I have I've covered a lot of these briefings particularly over this week since president trump has been showing up there in the briefing room I've never seen him as angry as I saw him today. It's exactly what you said he believes he's not getting a crack and enough credit for the administration that his shot at that for the job that his administration is doing he's. Very much blaming the Obama administration he says for for what was left behind in the mess he's got he's had to clean up and he's really just been angered by any questions that challenged. Where we are as as a nation involving this administration is handling of the corona virus. The crisis but them but I've never seen Lindsay frankly an angrier president inside this briefing room he was not happy with the reporters in their today and there were a number of testy exchanges. My included when he was asked just basic questions about what his message would be to Americans who are living in fear right now. But important and critical that we keep asking those questions easily beta thank you so much.

This transcript has been automatically generated and may not be 100% accurate.

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