Saudi King Salman met with Obama at the White House on Friday as the Obama administration aimed to use the visit to shore up relations after a period of tensions.
The visit is the king's first to the United States since ascending to the throne in January 2015, and comes after the United States agreed to a nuclear deal with Iran in July.
Speaking after the meeting between Obama and Salman, Saudi Foreign Minister Adel al-Jubeir said Obama had assured the Saudi king that the agreement guarantee peaceful nature of Iran's nuclear activities and includes inspections of military and suspected sites, and has a provision for the snapback of sanctions if Iran violates the agreement.
Under those conditions, al-Jubeir said, Saudi Arabia supported the deal.
Persian Gulf Arab states had previously expressed their support for the Iran nuclear deal; IRNA reported.