President Trump says he'll make a decision "fairly soon" on whether to launch a missile attack on Syria.
What seems to be delaying that decision is the fear a strike could spark a much bigger war than anyone wants.
It is a military decision and one with enormous risk that could trigger a Russian retaliation, ITV's Robert Moore reports.
America is moving naval assets towards the Mediterranean and has already deployed them within missile range of Syria.
The worry of Russian retaliation is real and there still appears to be an idea to punish Syria.
But that doesn't mean that is something Trump is willing bet his presidency on, which could result in a direct military clash with Russia.
The Secretary of Defence Jim Mattis has made it clear he has significant concerns over the unforeseen consequences of a strike on Syria.