"Iran wasn't racing to a weapon before the deal. There is no indication that I'm aware of that, if the deal no longer existed, that they would immediately turn to racing to create a nuclear weapon today." - Pompeo.
So for these guys, Iran deal was a bad deal because Iran was steps away from creating a nuclear weapon and relieving sanctions would have accelerated that (remember Bibi's cartoon?). Now Iran deal is still a bad deal that the US should no longer respect because there's no evidence suggesting that Iran is on the verge of creating a nuclear bomb. Not only that, such evidence didn't exist even before the deal.