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 MurphyLawmakers feel pressure on guns Trump to take steps to ban bump stocks Kasich’s campaign website tones down gun language after Florida shooting 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 KaineSave lives, restore congressional respect by strengthening opioids’ seizure Overnight Finance: Lawmakers, Treasury look to close tax law loopholes | Trump says he backs gas tax hike | Markets rise despite higher inflation | Fannie Mae asks for .7B Bipartisan Senate group says they have immigration deal 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 CardinWashington puts Ethiopia's human rights abusers on notice Overnight Defense: Mattis vows Dreamers in military won't be deported | Pentagon unsure if military parade will be in Washington | Dem bill would block funds for parade Dems introduce bills to block funds for Trump's proposed parade MORE (D-Md.) and Joe ManchinJoseph (Joe) ManchinPavlich: The claim Trump let the mentally ill get guns is a lie Toomey to introduce bill broadening background checks for firearms Scott Walker backs West Virginia attorney general in GOP Senate primary 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) MenendezJustice Dept intends to re-try Menendez in corruption case DACA is neither bipartisan nor in America's interest Senate DACA deal picks up GOP supporters 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 KirkHigh stakes as Trump heads to Hill Five things to watch for at Trump-Senate GOP meeting Giffords, Scalise highlight party differences on guns MORE (R-Ill.) to extend the Iran Sanctions Act, which expires at the end of the year. 

Sen. Bob CorkerRobert (Bob) Phillips CorkerCongress punts fight over Dreamers to March Drama surrounding Shulkin — what is the future of VA health care? Blackburn pushes back on potential Corker bid: 'I'm going to win' 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 McConnellLawmakers feel pressure on guns Bipartisan group of House lawmakers urge action on Export-Import Bank nominees Curbelo Dem rival lashes out over immigration failure 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.