Republican leaders in Congress are crafting their attack plan against the Obama administration’s nuclear deal with Iran.

Lawmakers will have 60 days to review the deal after the White House delivers the text of the historic agreement to Capitol Hill. The GOP could seek to move a measure of disapproval, but it will be difficult to win a filibuster-proof 60 votes, much less the 67 required to overcome a presidential veto.

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Sen. Bob Menendez Robert (Bob) MenendezKasie Hunt to host lead-in show for MSNBC's 'Morning Joe' Senators ask for removal of tariffs on EU food, wine, spirits: report VOA visa decision could hobble Venezuela coverage MORE (N.J.) voiced the strongest criticism of the deal among Senate Democrats, but his office insisted he remained undecided on whether to support it.

But Republicans believe they will win the public relations battle on the deal, which largely unites the GOP and threatens to divide the Democratic Party.

Some Senate Republicans are thinking about moving a motion of approval of the deal, believing it would put Democrats in a tough spot ahead of next year’s elections. Such a move in the upper chamber could lead to less than half of the Senate backing the president, allowing for more favorable headlines for the GOP. The House, however, is more likely to pass a resolution of disapproval.

A third option is to move legislation sponsored by Menendez and Sen. Mark Kirk Mark Steven KirkLiberal veterans group urges Biden to name Duckworth VP On the Trail: Senate GOP hopefuls tie themselves to Trump Biden campaign releases video to explain 'what really happened in Ukraine' MORE (R-Ill.) placing new sanctions on Iran, which the Banking Committee passed earlier this year and has Democratic support.

“All options are on the table,” said a Republican member of the Senate Foreign Relations panel who requested anonymity. “I wouldn’t take anything off.”

Republicans will likely use the Iran votes as ammunition on the campaign trail in 2016. But Democrats have the bully pulpit, and the Obama administration has initiated a huge campaign to sway the public.

New York Sen. Charles Schumer Chuck SchumerRepublican senator says plans to confirm justice before election 'completely consistent with the precedent' Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Graham signals support for confirming a Supreme Court nominee this year MORE, the third-ranking member of the Senate Democratic leadership, is emerging as a critical vote.

Senate Republicans need to hold their ranks and persuade 13 Democrats to vote with them to override President Obama’s threatened veto of a resolution of disapproval.

“If Schumer comes out and says, ‘I looked at the bill and studied its details and think it’s a good deal and will stop Iran from getting weapons,’ there will be zero hope of overriding an Obama veto,” said Noah Pollak, executive director of the Emergency Committee for Israel, which funded a six-figure Web campaign targeting Schumer earlier this year.

“If Schumer says this doesn’t do it, it lifts the arms embargo and doesn’t have anytime, anywhere inspections, then we have a fight on our hands. He’s a linchpin or a bellwether,” he added.

Schumer and other Senate Democrats held off on judging the deal Tuesday.

“I intend to go through this agreement with a fine-tooth comb, speak with administration officials, and hear from experts on all sides,” Schumer said in a statement. “Supporting or opposing this agreement is not a decision to be made lightly, and I plan to carefully study the agreement before making an informed decision.”

Colleagues say Schumer appears genuinely torn.

“He’s very sober. He said, ‘I’m going to make a decision on this based on what’s best for the country,’ ” said a Democratic colleague speaking on background.

Rep. Eliot Engel (N.Y.), the top Democrat on the House Foreign Affairs Committee and a leading Iran critic, said the deal is “deeply troubling.”

He noted that under the agreement, an arms embargo on Iran will be lifted within five years and sanctions on its ballistic missiles will be lifted within eight.

Jewish groups, led by the American Israel Public Affairs Committee (AIPAC), will launch a massive lobbying campaign targeted at swing Democrats.

“There’s going to be a giant push from all the Jewish groups, AIPAC, everybody,” said a source familiar with the group’s plan, predicting a pressure campaign funded with millions of dollars.

Senior administration officials are planning their own major lobbying offensive.

National security adviser Susan Rice, Vice President Biden and Tony Blinken, deputy secretary of State, have already started working the phones, according to senators.

Obama called Speaker John Boehner John Andrew BoehnerLongtime House parliamentarian to step down Five things we learned from this year's primaries Bad blood between Pelosi, Meadows complicates coronavirus talks MORE (R-Ohio) and House Democratic Leader Nancy Pelosi (Calif.) Monday night to alert them a deal was imminent.

Boehner John Andrew BoehnerLongtime House parliamentarian to step down Five things we learned from this year's primaries Bad blood between Pelosi, Meadows complicates coronavirus talks MORE told the president he was “skeptical” about the deal.

Senate Foreign Relations Committee Chairman Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.) said Tuesday his panel will hold hearings on the pact over the next three weeks, and predicted a vote in September after the August recess.

Senate Armed Services Committee Chairman John McCain John Sidney McCainMomentum growing among Republicans for Supreme Court vote before Election Day McConnell urges GOP senators to 'keep your powder dry' on Supreme Court vacancy McSally says current Senate should vote on Trump nominee MORE (R-Ariz.) said his panel would hold separate hearings, focusing on verifying that Iran is complying with a long-term agreement.

McCain said if Republicans don’t have enough votes to overturn the deal with a disapproval resolution, they could send a strong signal by forcing a vote on an approval measure that attracts only weak support.

“That would be a great signal,” he said.

He called the prospect of passing the Kirk-Menendez sanctions bill “extremely difficult.”

Senate Minority Leader Harry Reid Harry Mason ReidDemocrats fear Russia interference could spoil bid to retake Senate Graham signals support for confirming a Supreme Court nominee this year Trump signals he will move to replace Ginsburg 'without delay' MORE (D-Nev.) said lawmakers will be briefed by the administration and that those talks will be “extensive in nature.”

Pushing a Senate vote on the Iran nuclear deal until September would give opponents more time to mobilize and pressure Democrats to buck the administration.

A Senate Democratic leadership aide expressed concern that leaving the deal twisting in the wind for two months could give Republicans enough time to muster 67 votes for a veto override.

“The fact that there’s a vote in September makes me worry. If the votes were held now, we’d be fine,” said the aide.

In a statement delivered at the White House with Biden standing alongside him, Obama said, “I will veto any legislation that prevents the successful implementation of this deal.”

Corker predicted the president could change his mind if a resolution of disapproval gains enough political momentum, citing the Iran Nuclear Agreement Review Act, which Obama initially opposed but then signed into law.

“I would like to remind him, you know, he said the same thing about the Iran Review Act,” Corker said when asked about the latest veto threat.

Obama’s deal won a boost Tuesday when former Secretary of State Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE, the front-runner for the Democratic presidential nomination next year, endorsed it during meetings with Democratic lawmakers.

“This is an important step in putting a lid on Iran’s nuclear program,” Clinton told reporters following a meeting with House Democrats.

Her upstart rival for the nomination, Vermont Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I), also spoke favorably of it.

“I congratulate President Obama, Secretary Kerry and the leaders of other major nations for producing a comprehensive agreement to prevent Iran from obtaining a nuclear weapon,” he said in a statement. “This is a victory for diplomacy over saber-rattling and could keep the United States from being drawn into another never-ending war in the Middle East.”

Jordain Carney, Kristina Wong, Scott Wong and Mike Lillis contributed.

This story was updated at 1:26 p.m.