Christine Romans is chief business correspondent for CNN. The opinions expressed in this commentary are her own.

In a public health crisis that demands facts, leadership and gravitas, President Donald Trump riffs -- and he tweets.

And it doesn't help market sentiment.

"The botched policy response by the administration is adding to investor concerns," says Mark Zandi, chief economist at Moody's Analytics. "The administration's first response was Pollyannaish, asking for only a few billion of dollars to address the emergency and (encouraging Americans) to buy stocks on the dip."

Indeed, on February 24, as stocks wobbled, the president declared via Twitter: "CDC & World Health have been working hard and very smart. Stock Market starting to look very good to me!"

Two weeks ago, his chief economic adviser Larry Kudlow suggested three separate times in news interviews that long-term investors buy on the dip. Those investors would have lost money.