“America and our five negotiating partners ... have reached an historic agreement with Iran to end their pursuit of nuclear weapons for years and, maybe, forever,” Carper wrote in an op-ed piece published by The News Journal Thursday evening.

“The deal provides Iran an opportunity to rebuild its economy and shed the pariah status it’s borne for decades,” he added.

About 50 people gathered on Wednesday outside the Wilmington offices of Carper and

, D-Del., urging them to support the agreement in the interest of avoiding war with Iran.

Carper is the 30th Senate Democrat to come out in favor of the agreement. Just two Senate Democrats have said they will oppose the accord in Congress — Senator Chuck Schumer of New York and Senator Robert Menendez of New Jersey.

Iran and the Group 5+1 (Russia, China, the US, Britain, France and Germany- also known as P5+1 or E3+3) finalized the text of lasting deal on Tehran’s nuclear program on July 14.

While the United Nations Security Council has adopted a resolution to endorse the deal, the text of the document needs to be reviewed by both Iran’s Parliament and the US Congress.

US President Barack Obama has promised a swift veto in the event of a Congressional rejection of the agreement in September. US lawmakers would then have to find enough votes to override the president.