President Trump is in the process of building a new coalition of allies to participate in a multi-nation "strike force" attack on the Syrian government. This talk of coalition action reflects the rapid escalation of plans since US officials embraced Saturday's allegations of a chemical weapons strike.
Officials said as early as Sunday that the claimed Saturday attack would lead to a US military strike, and President Trump indicated this would happen "very soon." Instead of a one-off strike, as with last April's tomahawk missile bombardment of Syria, the US seems to be envisioning starting a whole new war over it.
This new US-led war in Syria doubtless suits much of the administration just fine. After all, this time last week US officials were trying to talk President Trump out of ending US military involvement in Syria. Now, they seem to have a pretext for an open-ended conflict.
This does make starting the war something of a scramble, despite officials still presenting themselves as not wholly decided. The Organization for the Prohibition of Chemical Weapons (OPCW) has been invited to investigate the allegations, and with no concrete evidence the Saturday attack even took place, such a finding by the watchdog could easily derail the war.