On Tuesday, Iran and the P5+1 group of countries — the United States, Russia, China, France and the United Kingdom plus Germany — announced a final comprehensive agreement on Tehran's nuclear program.
"For the United States, because of a congressional action, to isolate our country on such an important issue, would be devastating to our standing in the world."
Earnest added that the effect of international sanctions is what brought Tehran to the negotiations and a ‘No’ vote by the Congress would remove the leverage of sanction reinstatement, the threat that currently ensures Iran's implementation of the treaty.
"Iran will get all the benefits of this deal without having to give up anything," the spokesman pointed out.
On Friday, US Congressman Peter Roskam said in a statement that the Republicans introduced a resolution with the support of 171 members — about two-thirds of House Republicans and 40 percent of all members of the House — condemning the nuclear agreement between the international powers and Iran.