Casus Belli?

[Planigale]

US sends $8 bn of arms to Saudi and Qatar against the will of congress to 'defend' against Iran.
https://www.bbc.co.uk/news/world-us-canada-48404923

 

[Planigale]

So things heating upp faster than I expected.
https://www.bbc.co.uk/news/world-middle-east-48630374

US blames Iran for attacks on tankers. (Although the method of attack currently seems a bit uncertain.

 

[Oystein]

I expect some sabre-rattling, but not a war. I don't see how that's in anyone's interest.

Being at war is a virtual guarantee for re-election.

 

[Giz]

Trump threaten to destroy Iran.
https://www.bbc.co.uk/news/world-us-canada-48329852
It is worth considering the response if the Iranian president spoke about Israel in the same terms. There would be wide spread criticism.

You mean like:

“Israel, a small country of less than eight million people, looks out at a world where leaders of much larger nations threaten to wipe it off of the map.”

— President Obama, speech to the U.N. General Assembly, September 21, 2011
(Referencing Iran threatening Israel)