Over 160,000 people have signed a petition from a progressive organization denouncing 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’s (D-N.Y.) opposition to the Iran nuclear agreement.

“New York Senator Chuck 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 just publicly declared that he will vote to kill the historic Iran nuclear peace deal and urge other Democrats in the Senate to do the same,” the petition, issued by CREDO Action, begins.

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“There’s no excuse for any Democrat to oppose the deal — least of all Senator Schumer, who is in line to take over leadership of the Senate Democrats once Senator 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 retires.

“Chuck Schumer was wrong on Iraq when he voted for war and he is wrong on Iran,” the petition continues. “Schumer’s decision to join Republicans in attempting to sabotage the Iran nuclear deal once again shows that he is unfit to lead Senate Democrats.

“Tell Sen. Chuck Schumer: Don’t lead Senate Democrats to war with Iran,” it adds.

Schumer announced last week that he would oppose the nuclear deal with Iran, delivering a blow to the administration's effort to rally Democratic senators.

The decision sparked anger among liberal groups, with others, including MoveOn.org, pouncing on Schumer, who is poised to be the next Democratic Senate leader.

Schumer defended his decision, writing in an Aug. 6 post on Medium that “Advocates on both sides have strong cases for their point of view that cannot simply be dismissed.

“This has made evaluating the agreement a difficult and deliberate endeavor, and after deep study, careful thought and considerable soul-searching, I have decided that I must oppose the agreement and will vote yes on a motion of disapproval.”

White House press secretary Josh Earnest wouldn't say if Schumer's decision should disqualify him from leading the party in the upper chamber, saying it was a "question for Democratic senators" a day later.

CREDO Action is a “social change organization that supports activism and funds progressive nonprofits,” according to its website.

The group has also started the Twitter hashtag “#WarmongerChuck” as a part of the effort to reprimand the senior New York senator for breaking with his party.

The petition, which has a goal of 200,000 respondents, was started Saturday.