And it went up today?
Every disaster, bit of bad news, commodity price fluctation, some big wig farts, etc - market goes down for a few days, then it goes back up. Hurricanes, oil spills, gold, elections, you name it... Sell off in a panic, then buy back when prices are low.
Market's been shaping for a big correction for a while, a recession expected this year. This might be it, or this might be a correction enough for now to stave off a more severe recession that could have happened later.
To blame this on a speech is ludicrous, to blame it on the Administration's response is really stretching it some, although it might have spiked the panic a tad.
What we do have is a pandemic that media has hyped to the point that everyone is stopping from living normally and emptying shelves out. People are going to end up more in danger from their own stupidity than from the viral outbreak. Try being elderly and short on the ability to keep making runs to the store to stock up on what ain't there and see how that pans out after a few weeks.