The strongest proponents of withdrawing from the treaty are Republicans (51% say the US should withdraw), conservatives (47%) and those who approve of the job Trump is doing as President (46%).

Support for remaining in the agreement comes even as a strong majority of 62% say they believe Iran has violated the terms of the agreement. Nineteen percent said Iran has not violated the terms, with the same share saying they have no opinion.

Those who approve of the way Trump is handling the presidency (80%) are apt to say Iran has violated the agreement’s terms, while Democrats (30%) are most likely to say Iran has not violated those terms.