An early push in the Senate to pass new sanctions targeting Iran's ballistic missile program is threatening to divide Democrats. 

While lawmakers on both sides of the aisle are still hashing out the specifics, the issue is already splitting Democrats into two camps: Lawmakers who believe recent sanctions from President Obama go far enough and those who think Congress needs to further crackdown on Iran. 

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Sen. Chris MurphyChristopher (Chris) Scott MurphySaudi mystery drives wedge between Trump, GOP Overnight Defense: Trump worries Saudi Arabia treated as 'guilty until proven innocent' | McConnell opens door to sanctions | Joint Chiefs chair to meet Saudi counterpart | Mattis says Trump backs him '100 percent' Pompeo: Saudis committed to 'accountability' over journalist's disappearance MORE (D-Conn.) defended the administration's recent actions on Tuesday, calling the sanctions against 11 individuals tied to Iran's missile program “sufficient.”

“I think we should hold over Iran's head the prospect of additional sanctions should they continue to test, but I'm supportive of the steps the administration took,” he said, dismissing the need for Congress to take additional action. 

But Sen. Tim KaineTimothy (Tim) Michael KaineOvernight Defense: Trump says 'rogue killers' could be behind missing journalist | Sends Pompeo to meet Saudi king | Saudis may claim Khashoggi killed by accident | Ex-VA chief talks White House 'chaos' | Most F-35s cleared for flight Democrats torch Trump for floating 'rogue killers' to blame for missing journalist Election Countdown: O'Rourke brings in massive M haul | Deal on judges lets senators return to the trail | Hurricane puts Florida candidates in the spotlight | Adelson spending big to save GOP in midterms MORE (D-Va.), who had pushed for the administration to crackdown on Iran, said he's “not sure there's a need for more [sanctions.]”

Sens. Ben CardinBenjamin (Ben) Louis CardinSaudi mystery drives wedge between Trump, GOP Overnight Defense: Trump worries Saudi Arabia treated as 'guilty until proven innocent' | McConnell opens door to sanctions | Joint Chiefs chair to meet Saudi counterpart | Mattis says Trump backs him '100 percent' Turkish police have 'certain evidence' missing Saudi journalist was killed: report MORE (D-Md.) and Joe ManchinJoseph (Joe) ManchinTrump makes new overtures to Democrats Gillibrand backs Manchin, Bredesen despite their support of Kavanaugh Senate heads home to campaign after deal on Trump nominees MORE (D-W.Va.), who both opposed the nuclear deal, suggested that new sanctions against the missile program could get Democratic support. 

“It's something I'm very interested in. That was one of the reasons I could not support the original deal,” Manchin told The Hill. “On the Democratic side, I think it will be very well received.”

Sen. Bob MenendezRobert (Bob) MenendezTrump lowers refugee goal to 30,000, he must meet it Blame Senate, not FBI, for Kavanaugh travesty Dems urge tech companies to remove 3D-gun blueprints MORE (D-N.J.) also said Tuesday that he's working on new sanctions legislation unrelated to Iran’s nuclear program. He introduced legislation last year with Sen. Mark KirkMark Steven KirkThis week: Trump heads to Capitol Hill Trump attending Senate GOP lunch Tuesday High stakes as Trump heads to Hill MORE (R-Ill.) to extend the Iran Sanctions Act, which expires at the end of the year. 

Sen. Bob CorkerRobert (Bob) Phillips CorkerSaudi mystery drives wedge between Trump, GOP Dem Senator: Congress will act on death of Saudi journalist Democrats torch Trump for floating 'rogue killers' to blame for missing journalist MORE (R-Tenn.), the chairman of the Foreign Relations Committee, said Tuesday that he’s working on a package of Iran-related bills that would go further than the administration’s. 

“We're still hashing out the framework of what it would look like right now,” he said.

Corker also acknowledged the proposal will have to win support from Democrats to pass the Senate.

The renewed push in the Senate comes as House lawmakers voted — for a second time — on Tuesday evening to block the administration from lifting sanctions on Iranian entities unless it certifies they aren’t tied with terrorism or ballistic missile development. 

Asked about the potential for the Senate to take up legislation, Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellGraham: I hope Dems 'get their ass kicked' for conduct around Kavanaugh Saudi mystery drives wedge between Trump, GOP Overnight Defense: Trump worries Saudi Arabia treated as 'guilty until proven innocent' | McConnell opens door to sanctions | Joint Chiefs chair to meet Saudi counterpart | Mattis says Trump backs him '100 percent' MORE (R-Ky.) told reporters last month that Iran would likely be an "ongoing issue" and that they would be getting "advice" from the Foreign Relations Committee on potential next steps.