Rubio: I would revoke Iran nuclear deal as next US president

Potential Republican presidential candidate Marco Rubio says he would revoke any Iran nuclear agreement reached during the Obama administration if he was elected as the US president in 2016.

The Florida senator said he would "absolutely" defy European negotiating partners over the deal.

The P5+1 group – the US, Britain, Russia, China, France plus Germany – are in talks with Iran to reach a comprehensive final nuclear agreement after an interim deal was signed in November 2013.

A group of Republican senators, who are against any deal with Iran, have been trying to sabotage the nuclear negotiations.

"The United States, although it's less than ideal, could unilaterally re-impose more crushing and additional sanctions," Rubio said in an interview with The Associated Press, adding that the next president "should not be bound" by a potential deal.

The Florida Republican said he would also “use the standing of the United States on the global stage to try to encourage other nations” to impose sanctions.

Meanwhile, 47 Republican senators warned Iran in an open letter that the outcome of the nuclear talks would not be acceptable without Congress approval and could be revoked when President Barack Obama leaves the White House in 2017.

The letter said a potential nuclear agreement with Iran would be a “mere executive agreement” that could be revoked “with the stroke of a pen and future Congresses could modify the terms of the agreement at any time.”

President Obama, however, said that he is confident that a potential deal would be implemented.

"I think what we're going to focus on right now is actually seeing whether we're going to get a deal or not. Once we do, if we do, we'll be able to make the case to the American people, and I'm confident we'll be able to implement it," Obama said.