He's written a piece for @Telegraph outlining his argument, which will be delivered in DC tomorrow.
telegraph.co.uk/news/2019/09/1…
Says in @Telegraph piece that Britain should join US in trying to stop all Iranian oil exports.
He's already ditched May's rejection of Operation Sentinel, the US-led mission to police the Strait of Hormuz.
Plus it's a useful symbol of his 'remaining European while leaving EU' line. But certainly one to watch.