"But I believe we have a responsibility to pursue diplomacy, and that we have a unique opportunity to make progress with the new leadership in Tehran," he said.
Western leaders have said Iran seems to sound different under the leadership of Rouhani, who replaced Mahmoud Ahmadinejad as president this summer. On Friday, it was Rouhani's turn to return the compliment, saying European Union officials and Obama sound "different compared to the past."
Rouhani told reporters Friday his election helped pave the way for better relations between the Iran and the West, which has imposed heavy sanctions on the country. He also said Iran wants quick resolution to the nuclear issue. Western leaders believe the country's nuclear program is designed to produce weapons. Iranian leaders have said it is purely peaceful.
"I assure you that on the Iranian side, this will is there fully, 100%, that within a very short period of time, there will be a settlement on the nuclear issue," he told reporters.