Secretary of State John Kerry, Secretary of Energy Ernest Moniz, and Secretary of the Treasury Jack Lew appeared before the Senate Foreign Relations Committee on Thursday to answer senators’ questions on the historic nuclear agreement reached with Iran last week. Republican presidential candidate and US Sen. Marco Rubio (R-Florida) asked about a provision of the agreement that seems to obligate the US and its negotiating partners to help protect Iranian nuclear sites against potential outside attack.

According to Annex III, the agreement’s section on “civil nuclear cooperation,” the signatories commit to “co-operation through training and workshops to strengthen Iran’s ability to protect against, and respond to nuclear security threats, including sabotage, as well as to enable effective and sustainable nuclear security and physical protection systems. This provision of the deal doesn’t mention any countries by name. But Rubio wondered if this was included in the deal because of Iranian concerns related to a specific US ally. MORE