Any quarantine or removal of people from airline manifests has to take place in other countries. Not our own. How much influence do we have to see that done...and done properly? Those are countries heavily run by corrupt bureaucracies, nepotism, and bribery....at every level, every facility.
Once arrived here....the entire plane would need to be quarantined. The civil rights outrage of Americans on board would be significant.
Would our govt be wrong to do so? IMO no...but there really is no way Obama can do this 'right' in many people's eyes. If he did indeed impose such quarantines, the public outrage would also be off the scale...and that would just be the beginning, in terms of quarantine infringements on people's rights.