(JTA)—There are 28 Jewish members of Congress: 26 Democrats, one independent who caucuses with the Democrats and one Republican. Nine of them are senators and 19 are representatives.

Nine back the Iran deal, seven oppose it and 12 are undecided.

The positions of Jewish lawmakers are being watched as Congress decides whether to reject the July 14 agreement between Iran and world powers. The vote, to be held by the end of September, is expected go against the deal. The real question is: Will opponents manage two-thirds majorities in the House of Representatives and the Senate to overr...