The White House has warned Congress that rejecting President Barack Obama�s nuclear agreement with Iran would isolate the United States and trigger another war.

The Iran nuclear accord was supported by nearly 90 countries, �including countries like China, India, Japan, South Korea, Turkey and Taiwan," White House Press Secretary Josh Earnest told reporters on Thursday.

"So the number is significant because it serves to illustrate how difficult it would be; basically why it would be impossible for us to re-impose sanctions if Congress were to kill this deal," Earnest said.

"And the fact is, killing the deal only makes the need to use the military option more likely because it's going to be impossible for us to reassemble an international coalition to reach a diplomatic agreement," the spokesman added.

�If the United States steps away from this agreement, it certainly is fair for Iran to start calling everybody's bluff," Earnest said.

Iran and the P5+1 group -- the United States, Britain, France, China, Russia and Germany � reached a conclusion on the Joint Comprehensive Plan of Action (JCPOA) on July 14 in the Austrian capital of Vienna following days of intense talks over Tehran�s nuclear program.

On Thursday, Obama sought to build political support beyond Washington for the Iran nuclear agreement, urging thousands of supporters from across the US to push Congress to support the deal.

Obama said opponents are spending millions of dollars in order to sabotage the deal and try to make another war.

The US president made the comments when he spoke by phone with thousands of people affiliated with liberal activist groups Organizing for Action, the Center for American Progress and Credo Action.

Most Republicans oppose the nuclear agreement, but they need a two-thirds vote in both chambers of Congress to override a presidential veto and to reach that threshold, Republicans need Democrats� support.

Congress is reviewing the agreement and will vote on it in September.

By Press TV