US spy chief, James Clapper said that strict monitoring of Iran remains a key focus of the US intelligence community and the International Atomic Energy Agency (IAEA), Jerusalem Post reported.
"We need the basic foundational information and insight provided by those inspections and surveillance capabilities represented by the IAEA, which then we would double check, verify with our own organic intelligence capabilities and that of our partners, and notably, the Israelis," said the US national intelligence director.
"My focus and the focus of the intelligence community is our ability to verify if negotiations are successful and there are some agreements struck, is our ability to monitor and verify that" Clapper said.
His remarks come as the US has quietly cautioned Israel not to undercut Iran nuclear negotiations that resumed on Monday as Prime Minister Benjamin Netanyahu prepared to make the case against his diplomacy before the US Congress.
Netanyahu said that he fears US President Barack Obama's Iran diplomacy could allow Israel's arch Middle East adversary to develop atomic weapons.
US officials say the best way to prevent that outcome is a negotiated settlement.
Washington and some allies, notably Israel, suspect Iran has used its civilian nuclear program as a cover to develop a nuclear weapons capability.
Iran denies this, saying its program is for peaceful purposes such as generating electricity.