The controversial agreement has left many Democrats with a tough decision.
Republicans are unified against the deal, which would lift sanctions on Iran in exchange for limits on its nuclear program.
GOP leaders are planning a vote to disapprove before the end of the 60-day congressional review period. Obama has vowed to veto any effort to block the deal and can afford to lose no more than 43 House Democrats to sustain a veto.
Here is how House Democrats who oppose the deal stand on the Iran deal.

NO (21)
Rep. Brad Ashford (Neb.) — “Ensuring that Iran does not achieve its goal of acquiring a nuclear weapon is a critical goal, but it cannot be decoupled from the broader problems facing the region.  It is for these reasons that I cannot support this deal and will vote to disapprove the agreement,” Ashford said in a statement.
Rep. Brendan Boyle (Pa.) — “The nuclear agreement with Iran doesn’t make war less likely. It makes war more likely,” said Boyle in an op-ed for the Philadelphia Inquirer.
Rep. Tony Cardenas (Calif.) — “I will vote in favor of the people of the United States, Israel and Iran, by voting against this deal,” Cardenas said.
Rep. Ted Deutch (Fla.) — “After a decade in public life working to stop Iran from ever acquiring nuclear weapons, I cannot support a deal giving Iran billions of dollars in sanctions relief — in return for letting it maintain an advanced nuclear program and the infrastructure of a threshold nuclear state,” Deutch wrote in an op-ed.
Rep. Eliot Engel (N.Y.) —  “I still believe that a negotiated solution is the best course of action. That’s the path I believe we should pursue. But after careful consideration of all of the material; more than a dozen hearings since the beginning of the negotiating period; and conversations with Administration officials, experts, and many of my constituents, I regret that I cannot support this deal,” said Engel, the top Democrat on the Foreign Affairs Committee.
Rep. Lois Frankel (Fla.) — “It’s too high a price to pay,” Frankel said, according to the Tampa Bay Times.
Rep. Gene Green (Texas) — “We need to work together to block it so that we can negotiate a stronger agreement,” he said in a statement.
Rep. Alcee Hastings (Fla.) — “Iran could undermine the agreement in ways that would be nearly impossible to stop,” Hastings said in a statement opposing the deal.
Rep. Steve Israel (N.Y.) — “At the end of the day, despite some positive elements in the deal, the totality compelled me to oppose it,” the highest-ranking Jewish House Democrat and former Democratic Congressional Campaign Committee chairman told Newsday.
Rep. Ted Lieu (Calif.) — “Ultimately this is a vote of conscience and I cannot in good conscience vote for a deal— absent fundamental regime change—that gives Iran a legal path to a vast nuclear infrastructure and lifts two crucial arms control provisions, the arms embargo and the ballistic missile ban. My conscience is clear. I will oppose the JCPOA,” Lieu said in a statement.
Rep. Daniel Lipinski (Ill.) — “I supported the effort of the P5+1 countries to negotiate an agreement with Iran that would have prevented it from becoming a nuclear weapons threshold state, but this agreement falls far short of the stated goals and does more to increase the likelihood of additional conflict than to bring peace,” Lipinski said in a statement.
Rep. Nita Lowey (N.Y.) — “This agreement will leave the international community with limited options in 15 years to prevent nuclear breakout in Iran, which will be an internationally-recognized nuclear threshold state, capable of producing highly enriched uranium,” she said in a statement.
Rep. Carolyn Maloney (N.Y.) — “There are strong arguments for and against the agreement but, as a matter of conscience, I have decided to oppose it,” Maloney said in a statement, first reported by the New York Daily News.
Rep. Grace Meng (N.Y.) — Meng called the deal “simply too dangerous” for Americans.
Rep. Donald Norcross (N.J.) — “We all know no deal is perfect or iron-clad. I’m not looking for perfection, but I do believe that a better deal can be achieved,” Norcross said in a statement.
Rep. Kathleen Rice (N.Y.) — The freshman lawmaker called the deal a “risk I cannot support” in an op-ed.
Rep. David Scott (Ga.) — “It’s a good deal for Iran, for Russia, China and probably Hezbollah, but is it not, definitely not a good deal for Israel or for the United States or our allies – especially Jordan and Saudi Arabia,” Scott said, according to a report from radio station WABE. “Under this agreement … it allows for Iran to get a nuclear bomb. In essence it sort of permits it too, within the agreement, without Iran having to cheat at all.”
Rep. Brad Sherman (Calif.) — “A strong Congressional vote against the Agreement is the best way to make it clear that the Agreement is not binding on Congress, the American people or future administrations,” said Sherman in a statement.
Rep. Kyrsten Sinema (Ariz.) — “I am concerned that this agreement will escalate a conventional arms race in the Middle East and further destabilize the region.”
Rep. Albio Sires (N.J.) — “I am opposed to the current proposed nuclear agreement with Iran. I do not feel the agreement will prevent them from acquiring a nuclear weapon,” he said in a statement in July.
Rep. Juan Vargas (Calif.) — “The deal fails to dismantle Iran’s nuclear program. It fails to guarantee intrusive enough inspections to ensure that Iran does not cheat, and it fails to keep Iran from achieving nuclear-threshold status,” Vargas said in an op-ed.
 

UNCLEAR/UNDECIDED (21)
Rep. Joyce Beatty (Ohio)
Rep. Robert Brady (Pa.)
Rep. Jim Cooper (Tenn.)
Rep. Henry Cuellar (Texas)
Rep. John Delaney (Md.)
Rep. Tulsi Gabbard (Hawaii) — “We cannot afford to make the same mistake with Iran that was made with North Korea,” Gabbard said in a statement.
Rep. Gwen Graham (Fla.)
Rep. Al Green (Texas)
Rep. Marcy Kaptur (Ohio)
Rep. Bill Keating (Mass.)
Rep. Sean Patrick Maloney (N.Y.) — “I look forward to carefully reviewing the Iran agreement in the days ahead. Any deal must prevent Iran from possessing nuclear weapons,” he said in a statement after the deal was announced.
Rep. Grace Napolitano (Calif.)
Rep. Collin Peterson (Minn.)
Rep. Charles Rangel (N.Y.)
Rep. Raul Ruiz (Calif.)
Rep. Loretta Sanchez (Calif.)
Rep. Mark Takai (Hawaii)
Rep. Bennie Thompson (Miss.)
Rep. Dina Titus (Nev.)
Rep. Norma Torres (Calif.)
Rep. Marc Veasey (Texas)
Rep. Filemon Vela (Texas)