The leverage Iran has is 100% tanking the world economy by shutting the straits, and tanking their neighbours. They don't really have any reason to stop- whatever Trump says- before they've proven they can; because otherwise Trump and Israel will be back for annual 'mowing the grass' exercises. The only way Iran stops that, is to make it clear what the consequences will be. Otherwise, they just get steadily weaker. It may seem odd that Trump doesn't understand that given that pretty much everyone else did, but that's the problem with being a massive unempathetic narcissist being egged on by sociopaths like Netanyahu and grade a certified cretins like Graham. Not only do you believe that people will do what you want them to because it's you doing the telling and believe circumstances will fall into line because it's you needing them to- the narcissist part- but you also think other people will behave as you would in the circumstances. ie do anything to preserve themselves, in the way you'd do it were the circumstances reversed... surrender. Pretty much everything Trump- and to be fair, the broader US and West in lesser part- has done for 20 odd years leads us to this place. If Iran is cut off from the western economy, then crashing it has no real disadvantages, for them. If they have no navy or ability to send their own ships, or oil capacity they have no reason to keep the Straits of Hormuz open. You've killed the father and most of the family including children and wife of the new leader. If the US has bombed them twice in the past year they need a guarantee it won't happen again in nine months when Trump needs a distraction from the disastrous midterms or whatever. The only way they get that, and make him enforce that on Netanyahu, is by making it very obvious what the consequences will be if it happens again. They do that by taking things beyond the 4 days grace releasing some emergency fuel grants.