What do you suggest Trump does at this point?
I don't know if Trump really thought Iran would "make a deal" or not.
I mean really; the entire regime is a death cult of sorts that do not value life in any capacity other than to use their lives to try and destroy Israel and the US.
No, they are not going to make a deal, in fact, they are loving this hoping it will sink the Trump administration as well as the US economy. They would gladly die for that, along with surrendering the lives of all their citizens. Again, they do not value human life in the least.
If I were Trump, I would maybe try to get the international community to take over the Straits of Hormuz in order to at least accomplish something here. It would take away one of the greatest leverages they have internationally that they have.
But don't pretend that Iran is only a problem for Israel. The entire Middle East has been tormented by their terrorism for decades as they would gladly be rid of them if they could. Therefore, they would have a vested interest in helping the US decrease their power considerably by having the international community take over that section of their country.
As for the WMD problem, I suppose you either go in and take out the entire regime, which no country on earth is willing to do, due to the problem that no country has the political will or money to do so, or you just wait will they use one of their WMD's But when they do use one, you simply wipe the entire country off the face of the earth using your own WMD's
Sadly, I don't see any other alternatives.