A group of United States senators, mostly Republicans, has called for President Barack Obama to take a  more firm public stance over the nuclear dispute with Iran.

More than one-third of US senators are sponsoring a non-binding resolution that lists reasons for why Iran is a threat.

The group wants Obama to reaffirm the US commitment to preventing Tehran from acquiring nuclear weapons.

Al Jazeera's Patty Culhane reports from Washington, DC.

Source: Al Jazeera