We've just heard from our US correspondent James Matthews, who is at the White House for us, and he has given us his view of Donald Trump's post that confirms Iran gave an early warning about its attack, and described it as "weak".
He said: "I think what Donald Trump has posted is peace. That's how peace is delivered these days.
"And in this cycle of violence, in a tit-for-tat situation, the question has been all day, what would America do? How would it react to this Iranian attack?
"And I think you have from Donald Trump there your answer."
There is "nothing" in the post that suggests he is "on the verge of furthering this conflict".
"Everything reads to me like a president who feels that the job is done," Matthews said.
That makes sense "for an American president who always styled this as an intervention not to start a 'forever war', but to prevent one from breaking out".
With Iran's nuclear programme effectively "neutered", Trump has "tweaked the politics and the military situation to suit American interests".
"Right now, he can look at the situation can claim victory. He's had his sugar-rush of military success... and can portray himself as a peacemaker," Matthews added.