But some do say the PM is taking her time. On one level, they say this is just her character, to be cautious and methodical, to play it by the book. She wants to work out what is in the UK national interest, to understand what other countries want to achieve, to assess all the options and consequences
And yes, that involves assessing the risk of losing a vote in Parliament on this. The scars of David Cameron’s defeat over proposed military action in Syria in 2013 have not entirely healed. This will matter if any military action is not a one-off but a sustained strategy that envisages air strikes the next time Syria drops chemical weapons and the next.
Crucially, I am told that Mrs May also wants to make sure that the case against Syria is as comprehensive as possible. She wants as much information as possible about the suspected chemical attack on Douma - above all, so she can say who was responsible.
She wants to make sure she has her ducks and arguments in a row for the potential political flak she could face. The discussions are similar to those over the Salisbury nerve agent attack, namely that Mrs May wants to be able to stand up in Parliament and say there is “no plausible alternative” to Syria being responsible.
There was a distinct note of caution in the official Downing Street account of the May/Trump phone call. This spoke of “reports” of Syrian chemical weapons attacks which were evidence of President Assad’s brutality “if confirmed”.
There are signs that the US and the French are also taking their time. Monsieur Macron seems keen to act but even he spoke yesterday of a decision “within days”. French sources tell me they expect another Macron/Trump call “in the next 48 hours”.