Dems back down from Iran sanctions fight

Senate Democrats on Tuesday backed down from a confrontation with President Obama over new Iran sanctions, agreeing to withhold support if Republicans bring legislation to the floor.

But the Democrats warned Obama they will only hold the line against the bill for roughly two months, after which point they would be ready to join with Republicans to muscle it through.

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"In acknowledgement of your concern regarding congressional action on legislation at this moment, we will not vote for this legislation on the Senate floor before March 24," read a letter to Obama spearheaded by Sen. Robert MenendezRobert (Bob) MenendezBuzzFeed story has more to say about media than the president More oversight of America’s international media networks a good idea Pro-Israel organizations should finally seek payback against Iran deal Dems MORE (D-N.J.), who is the co-author of the bill. 

The letter was signed by Democratic Sens. Charles SchumerCharles (Chuck) Ellis SchumerSunday shows preview: Shutdown negotiations continue after White House immigration proposal Trump blasts Pelosi for wanting to leave country during shutdown The Senate should host the State of the Union MORE (N.Y.), Richard Blumenthal (Conn.), Gary Peters (Mich.), Bob CaseyRobert (Bob) Patrick CaseyTrump pitches new plan to reopen government amid Dem pushback Dem senator references 'The Office' when posting job for Scranton regional manager  Sen. Casey says he won't run for president in 2020 MORE Jr. (Pa.), Ben CardinBenjamin (Ben) Louis CardinDC train system losing 0k per day during government shutdown IRS shutdown plan fails to quell worries GOP senators would support postponing State of the Union MORE (Md.), Chris CoonsChristopher (Chris) Andrew CoonsOvernight Defense: Trump unveils new missile defense plan | Dems express alarm | Shutdown hits Day 27 | Trump cancels Pelosi foreign trip | Senators offer bill to prevent NATO withdrawal Bipartisan senators reintroduce bill to prevent Trump from withdrawing from NATO Sunday shows preview: Washington heads into multi-day shutdown MORE (Del.), Joe ManchinJoseph (Joe) ManchinSenate rejects government-wide ban on abortion funding Centrist efforts to convince Trump to end shutdown falter Bipartisan group of senators will urge Trump to reopen government for 3 weeks MORE (W.Va.), Joe DonnellyJoseph (Joe) Simon DonnellyEPA's Wheeler faces grilling over rule rollbacks Some Senate Dems see Ocasio-Cortez as weak spokeswoman for party Senate approves funding bill, preventing partial government shutdown MORE (Ind.), and Debbie StabenowDeborah (Debbie) Ann StabenowSenate Dems raise concerns about shutdown's impact on assistance to taxpayers Durbin signals he will run for reelection Coal supporter Manchin named top Dem on Senate Energy Committee MORE (Mich.).

The new deadline allows Menendez and the other Democrats to support the legislation while honoring the wishes of Obama, who has warned that sanctions could derail the negotiations over Iran’s nuclear program and pave the way to a military confrontation.

A senior administration official traveling with the president aboard Air Force One said the move to delay the sanctions vote is seen by the White House as a” very constructive signal."

March 24 was already the date that negotiators had set for reaching a political framework for an agreement, with the overall talks set to conclude June 30.

The sanctions bill, which Menendez is co-sponsoring with Sen. Mark KirkMark Steven KirkDems vow swift action on gun reform next year This week: Trump heads to Capitol Hill Trump attending Senate GOP lunch Tuesday MORE (R-Ill.), would slap new sanctions on Iran beginning July 6 if no deal is reached, exacting new punishment on the country’s struggling economy.

Without the support of the 10 Democrats, Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellSunday shows preview: Shutdown negotiations continue after White House immigration proposal Senate to take up Trump's border-immigration plan next week Trump pitches new plan to reopen government amid Dem pushback MORE (R-Ky.) likely won’t have enough support to break a Democratic filibuster and get the bill to Obama’s desk.

But Republicans are eager to have the Iran debate, believing they have the upper hand by standing firm against Obama’s foreign policy and Iran’s nuclear ambitions.

Sen. Ted CruzRafael (Ted) Edward CruzGroup aiming to draft Beto O’Rourke unveils first 2020 video Howard Dean looking for a 'younger, newer' Democratic nominee in 2020 Congress can stop the war on science MORE (R-Texas) said McConnell should bring an Iran sanctions bill to the Senate floor immediately.

“I think it has been heartbreaking to see how few Democrats, even to this day, are willing to stand up to the Obama administration when it comes to the threat of Iran acquiring nuclear weapons capability,” he said. 

The March 24 deadline from Menendez sets the stage for a last-ditch push to try to reach the outlines of a deal.

In his letter, Menendez noted that the legislation would allow the president to waive additional sanctions for a month at a time to provide additional flexibility in the negotiations.

The Senate Banking Committee is planning to vote on the bill Thursday, and an aide to Menendez said he plans to co-sponsor and vote for it.

Schumer, another member of the committee, is also likely to vote for the bill. He said Tuesday he would co-sponsor it. 

If the 10 Democrats were to vote for a sanctions bill on the floor, Republicans would be close to a veto-proof majority of 67. Only three additional Democrats would be needed. 

Sens. Michael Bennett (D-Colo.) and Kirsten GillibrandKirsten Elizabeth GillibrandSunday shows preview: Shutdown negotiations continue after White House immigration proposal Ocasio-Cortez speaks about 'justice' at Women's March 2020 Democrats barnstorm the country for MLK weekend MORE (D-N.Y.) backed an earlier version of the sanctions bill in the last Congress, but they did not sign Menendez’s letter. 

Last updated at 6:19 p.m.

Justin Sink contributed.