“The P5+1 would fracture, the international community would blame the United States rather than Iran for the collapse of the negotiations, and the Iranians would conclude that there’s little point in pursuing this process at the negotiating table,” Rice said on Tuesday. Press TV reported.
She made the remarks at a conference hosted by The Wall Street Journal.
American lawmakers called on Congress to put more sanctions against Iran following the extension of talks between Tehran and the P5+1 countries -- the US, Britain, France, Russia, China and Germany.
The two sides wrapped up a week of intense nuclear negotiations in Vienna on November 24.
Iran and the six world powers agreed to extend the talks. They also agreed that the interim deal they had signed in Geneva last November remain in place during the remainder of the negotiations until July 1, 2015.
The Associated Press reported the powerful pro-Israel lobby AIPAC is pushing for tougher sanctions against Iran in response to the extension of the talks.
AIPAC is trying to persuade Washington to reinstate all economic sanctions that were suspended during the negotiations. It also wants the US to impose a ban on Iran’s oil exports to other countries and to put more Iranian industries on its blacklist, the report said.
White House press secretary Josh Earnest said that additional sanctions against Iran would be counterproductive.
"We continue to believe that adding on sanctions while negotiations are ongoing would be counterproductive," he said.
US Secretary of State John Kerry also defended the extension of the nuclear negotiations.
“We have made real and substantial progress, and we have seen new ideas surface,” he said.