US senators warn Tehran nuclear deal can be revoked after Obama leaves office ― RT USA

A group of US Republican senators has written an open letter to Iran’s leaders, suggesting that any decision based on nuclear negotiations with the current government and signed by President Obama can be revoked after he leaves office in early 2017.

Referring to the US Constitution, almost 50 politicians said that while it is the president who negotiates international agreements, "Congress plays the significant role of ratifying them."

"We will consider any agreement regarding your nuclear-weapons program that is not approved by the Congress as nothing more than an executive agreement between President Obama and Ayatollah Khamenei," says the senators' letter to the leaders of the Islamic Republic of Iran, as reported by Bloomberg.

Neocon push for 'military option' in Iran hurts US - White House ― RT USA

The White House blasted Senate Republicans’ open letter to Iran on Monday, comparing it to “efforts of neocons in the previous administration” to prefer military options over diplomacy, thereby harming America's standing in the world.

President Obama’s spokesman, Josh Earnest, said that regarding negotiations over Iran’s nuclear program, congressional Republicans are “ready to fast-forward to the military approach before the diplomatic approach has been given the opportunity to succeed.” This is consistent with the pattern of foreign policy decisions the Republicans have made over the past two decades, he said.