A lot of it is coming from reporters who were repeatedly asking Trump about it and being told they’re fake news. Also, what is congress supposed to do about it? They don’t control the CDC. They don’t control the borders being shut down.
If they believe inaction or action was placing the country at risk they have a duty to state the same. Which they most certainly would have done. Instead there were crickets. I don’t recall a single Dem asking for a travel ban prior to Trump instituting the same. In fact, several objected to the same.
The lack of focus on the WHO in the media is puzzling. Of all the parties involved (except perhaps the Chinese) they bear the most responsibility for the state the West currently finds itself in.