“Now AIPAC is rapidly losing ground in its biggest test as it mounts an all-out campaign to kill President Barack Obama’s nuclear deal with Iran,” this is according to an article published by Bloomberg Politics August 21.

“AIPAC’s effort looks increasingly likely to come up short. Republicans in the Senate are united in opposing the Iran deal, but they’ve been joined so far by only two Democrats, Chuck Schumer of New York and Bob Menendez of New Jersey,” it further added.

Ratification process of the document of Iran nuclear agreement is gaining momentum as Democrats have secured enough congressional support for the July 14 accord.

According to CNN, all 54 Senate Republicans are expected to vote for a resolution in mid-September disapproving of the accord, but to clear a procedural hurdle so the chamber can move on the bill, they need six Democrats to join them.

So far, New York's Chuck Schumer and New Jersey's Bob Menendez from the Democratic Party have said they will oppose the agreement.

While enough senators remain undecided to reach 60 votes against -- only 23 of 44 have committed to backing the Iran agreement so far.

Claire McCaskill of Missouri, who is close to Schumer, and Joe Donnelly of Indiana, two key undecided Democratic senators, announced their support for the conclusion of nuclear talks this week.

Iran and the Group 5+1 (Russia, China, the US, Britain, France and Germany) 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 ratified 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. Lawmakers would then have to find enough votes to override the president.