It is the Democratic view on the Iran deal, but there was a time that was a bipartisan effort. Then Bill Clinton was elected and bipartisanship went out the window. At least, that's as far as my memory goes.
It's so preposterous that the President of the United States making no sense whatsoever has become normal. Trump says Iran is violating the nuclear agreement, but he won't pull out just yet. Well, they're either in violation of the agreement, in which case you pull out right the freaking now; or they're not and you're just playing schoolyard bully.
You can't just say "This dangerous country with which we made a deal isn't respecting their end of the bargan, but we're letting it go for now." That doesn't make sense.