Obama had repeatedly, through his agency heads, tried to tamp down the growing public alarm over the Ebola scare. He trotted out Frieden and others, aided by some liberal media 'experts' to try and downplay the risks posed by continued flights of West Africans into the USA.
Eventually it became clear that indeed yes, one CAN get Ebola without rolling around in an Ebola victim's vomit, even sitting next to someone infected on a bus was highly dangerous, not because it was easy to catch, but because it was so fatal a disease if caught.
Two days ago, Democrat leaders and heavyweight democrat donors appealed to him to get out in front and try to salvage the sinking poll numbers of democrat candidates allied to the President. Now you can expect his handlers to suggest a beneficial timeline for him to replace Frieden, and to impose some sort of flight restrictions.
Ideally, this will occur within two weeks before the midterm elections to try and bump the polls favorably, and convince some voters that finally their rockstar President is doing something to 'save' them again.