US Joint Chiefs of Staff Chairman Gen. Joe Dunford has reported that he has been involved in discussions with the White House about the various military options being developed for attacking Syria if they ignore US threats to attack them for using chemical weapons.
Dunford said there is routine dialogue about the planning, and the status of the various military options being developed for Syria. The US has threatened to attack Syria on almost a daily basis, despite no public evidence that a chemical attack is going to happen.
That said, despite the constant threats, Dunford said no decision has actually been made to use force in Syria, even if this predicted attack actually does happen. Such a decision would presumably be made after the fact.
Of course, the US is threatening Syria over any number of things at any given time, and the development of more military options just means more ways President Trump can escalate after having already committed the US to “indefinite” military presence in Syria.