President Obama sought to reassure anxious Persian Gulf nations Thursday that the United States is committed to their security, insisting a nuclear deal with Iran would not leave them more vulnerable.

Obama and leaders from the six Gulf Cooperation Council countries met in a rare summit at Camp David, the presidential retreat in Maryland’s Catoctin mountains. The leaders were expected to issue a statement announcing new military commitments, including joint exercises and ballistic missile cooperation.

“We’re really looking at what we can do to expedite the provision of support and capacity building to the GCC,” said Ben Rhodes, Obama’s deputy national security adviser. […]