KING: This breaking news just in the FDA now ending the emergency use authorization of chloroquine and hydroxychloroquine. Those are the drugs of course that President Trump repeatedly called game changers in the treatment of Coronavirus. CNN's Senior Medical Correspondent Elizabeth Cohen is with us now. Elizabeth why the big about face?</s>ELIZABETH COHEN, CNN SENIOR MEDICAL CORRESPONDENT: Well, because they realized what other people realized from the very beginning, which is that this drug does not work against COVID-19. Everybody else it seems knew that before the FDA did. Let's take a look at the calendar of what happened here. Back in March, the FDA gave this emergency use authorization for hydroxychloroquine for COVID. In April, just one month later, the NIH and FDA itself said we're going to warn against using this. In May, there were two major studies published in very prestigious journal saying that it was ineffective, it didn't work and in fact one of those studies found that it increased the risk of cardiac arrest by more than twice. And then in June, today, that authorization was revoked. Now the FDA has come out since and said hey, when we authorized it, it was based on the evidence that was available at the time. But I will tell you, John I have spoke to the leading researchers on hydroxychloroquine in COVID and they said back then, and now, there's no evidence that it ever worked. This was just something that Trump wanted to tout. There was never really any evidence that this worked. John.</s>KING: Never really any evidence that this worked. But it was a game changer. Elizabeth Cohen, thank you so much for your insights there. Up next for us, the Harris County Director of Public Health joins us as the county starts a new threat level system.
FDA Ends Emergency Use Of Drugs Trump Called "Game Changers".