"Even if Congress votes this deal down, and I sincerely hope they will, the rest of the world has moved on in terms of the money flow," Fiorina told NBC on Sunday.

“(China and Russia) have wanted, for a very long time, to open the Iranian economy. They're in there. So are the Europeans,” Fiorina added.

She, however, said it is not too late for the US to back out of its obligations to provide sanctions relief to Iran and declare new terms for the deal.

"The new deal will be this: the United States of America will make it as difficult as possible for you to move money around the global financial system unless and until you open every military and every nuclear facility to real, anytime, anywhere inspections," Fiorina said she would tell the Iranians if elected president.

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.