Kerry said intensifying diplomatic efforts to resolve the dispute over Iran’s nuclear program could produce an agreement within the three- to six-month time frame that Iranian President Hassan Rouhani has called for.

“It’s possible to have a deal sooner than that depending on how forthcoming and clear Iran is prepared to be,” Kerry said in an interview aired on CBS’s “60 Minutes” on Sunday.

“If it is a peaceful program, and we can all see that – the whole world sees that – the relationship with Iran can change dramatically for the better and it can change fast,” he said.