Pompeo has called urgent meetings (rare on a Saturday) with key US politicians and officials. They are being referred to as crisis meetings. Further meetings hurriedly being coordinated with international allies for later today.

its unconfirmed so don't take it as gospel, but the journalistic scuttlebutt is that missiles are now primed and aimed at Iraq and they have been given firing orders.

The USA is ordering them to stand down or face massive pre-emptive strikes.

Might be why Graham is telling Trump to stand firm.