Senate votes against making Iran nuclear deal a treaty.

Byline: Deb Riechmann

WASHINGTON -- The GOP-controlled Senate on Tuesday turned back an attempt to elevate any nuclear deal with Iran into a treaty, a vote that gave momentum to Republicans and Democrats trying to pass a bill giving Congress a chance to review and possibly reject any agreement with Tehran.

The amendment, filed by Republican Sen. Ron Johnson of Wisconsin, failed 39 to 57.

Supporters want the bill passed free of controversial add-ons they claim could scuttle negotiations with Tehran, draw a presidential veto or leave lawmakers with no say on a national security threat.

As written, the legislation would block President Barack Obama from waiving congressional sanctions for at least 30 days while lawmakers weigh in on any final deal the U.S. and five other nations can reach with Iran. And it would stipulate that if senators disapprove the deal, Obama would lose authority to waive certain economic penalties -- an event that would certainly prompt a presidential veto.

The bill has gained tacit approval from Obama. He says he will sign it as written, but the White House warns that he will reconsider if the measure is substantially changed. Sen. Bob Corker, a lead sponsor of the bill and chairman of the Senate Foreign Relations Committee, said the measure in its current form, has 67 backers, enough to override a presidential veto.

Corker and his supporters are trying to bat down more than 50 amendments introduced so far -- all by Republicans.

Earlier in the day, Senate Minority Leader Harry Reid warned GOP presidential hopefuls in the Senate not to use...