WASHINGTON (AP) -- Senate Republicans will try a second time on Tuesday to move ahead on a resolution rejecting the Iran nuclear deal, and the outcome is expected to be the same: Democrats are poised to block the measure and preserve President Barack Obama's foreign policy win.

FILE - In this Sept. 10, 2015, file photo, Senate Minority Whip Richard Durbin of Ill., right, with Senate Minority Leader Harry Reid of Nev., holds up a copy of a letter signed by Senate Republicans. (AP Photo/Pablo Martinez Monsivais, File)

Last week, Senate Democrats blocked GOP attempts to get a disapproval resolution to Obama's desk and House Republicans settled for passing two related measures that are never expected to get out of Congress.

The international accord backed by the United States, Iran and five world powers would curb Iran's nuclear program in exchange for relief from crippling sanctions that have undercut Tehran's economy.

Senate Majority Leader Mitch McConnell, R-Ky., has scheduled another vote Tuesday to end debate, but that motion is likely to be blocked by Senate Democrats as well. It's unclear if this is the last vote the Republican-led Senate will take on the Iran nuclear deal.

Though measure is unlikely to advance, Republicans are staging the Senate vote to make political points against Democrats and in future Senate races. They point to polls showing Americans have reservations about the deal.

Republicans are also working to craft new sanctions legislation to maintain a hardline stance against Iran. Looking to next year's elections, Republican campaign committees also have targeted Democrats who backed the deal and some organizations against the deal already have threatened to withdraw political contributions from members of Congress who backed it.

The National Republican Congressional Committee issued several statements on Monday criticizing individual Democrats who were in favor of the deal, including those in Connecticut, Florida and New York. Katie Martin, communications director for the committee, described the agreement as a "dangerous deal with Iran" that will put U.S. national security and the safety of U.S. troops and allies at risk.


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