President Donald Trump was evasive Thursday about when the United States might attack Syria in retaliation for a chemical weapons assault, saying it could be "very soon or not so soon at all!"

A day after warning starkly that "missiles will be coming," Trump in another early morning tweet storm said: "Never said when an attack on Syria would take place. Could be very soon or not so soon at all!"

He added: "In any event, the United States, under my Administration, has done a great job of ridding the region of ISIS. Where is our "Thank you America?"