American Jews now oppose the Iran deal by a margin of two-to-one, according to a new poll–with those between 18 and 30 against the deal four-to-one.

The telephone poll of 1,035 registered voters, conducted by McKeon & Associates July 29 and 30, found that a large plurality of registered Jewish voters oppose the deal, 45% to 22%.

That is a sharp reversal from initial polls (though polling questions have varied).

As the Iran deal debate began, a large plurality of American Jews supported the Iran deal, 49% to 31%. A week later, a plurality opposed the deal, 45% to 40%. A week after that, the margin widened substantially.

The latest poll was commissioned by Citizens for a Safe Middle East, a group that was formed to oppose the Iran deal. In a statement, the group said:

The survey also found that opposition to the agreement crosses party lines. The results showed that a plurality of Democratic Jewish voters (40-38), a significant plurality of Independent Jewish voters (44-24), and overwhelming majorities of Republican Jewish voters (51-4) and those identifying as Libertarian Jewish voters) (71-4) oppose the deal.

The survey also found that opposition to the agreement crosses party lines. The results showed that a plurality of Democratic Jewish voters (40-38), a significant plurality of Independent Jewish voters (44-24), and overwhelming majorities of Republican Jewish voters (51-4) and those identifying as Libertarian Jewish voters) (71-4) oppose the deal.

“Every group across the spectrum is against the pact, even the administration’s fellow Democrats,” said spokesperson David Spak. “Folks recognize that the deal is not in our country’s best interests. Congress should insist that the administration go back to the negotiating table with a stiffer spine.”

On Thursday, Sen. Charles Schumer (D-NY) and Rep. Eliot Engel (D-NY), announced that they oppose the Iran deal. Schumer confirmed that he will vote to override President Barack Obama’s expected veto of a congressional resolution disapproving the deal.

The White House continued to lash out at opponents of the Iran deal, repeating the accusation that Republicans who opposed the deal had made “common cause” with the “hard-liners” in the Iranian regime.