US Secretary of State John Kerry said a final nuclear accord with Iran will require that Tehran disclose its past military-related nuclear activities.

“It will be part of a final agreement. It has to be,” Kerry said Wednesday during an interview with PBS NewsHour. The secretary of state insisted: “They have to do it. It will be done. If there’s going to be a deal, it will be done.”

As a part of its review of Iran’s nuclear program, the International Atomic Energy Agency has been looking into whether the Islamic Republic has attempted to build atomic weapons in the past. Although Tehran denies any military ambitions — past and present — the IAEA and several other countries believe it may have secretly worked to develop nuclear arms.

Get The Times of Israel's Daily Edition by email and never miss our top stories Free Sign Up

Iran has repeatedly stonewalled the United Nations’ nuclear monitoring agency from fully investigating the scope of its nuclear ambitions. However, according to Kerry, that will change under the terms of any June agreement, which would include “a very robust inspection system.”

Earlier Wednesday, the Iranian defense minister made clear that international inspectors would not be granted access to the state’s military sites under the agreement with the world powers on the country’s nuclear program.

During the interview, Kerry also discussed the mounting US domestic opposition the nuclear deal faces. He said Congress had a role in moving the framework agreement forward, provided it was “constructive.”

He cautioned against proposed legislation in Congress that would temporarily suspend US President Barack Obama’s authority to lift sanctions as part of final deal undermined the president’s authority.

“The president is absolutely correct in making sure that what Congress does, does not assault presidential authority and the Constitution, and doesn’t destroy his ability to be able to negotiate this final deal,” he said.

Referencing recent reports of Iranian ships in the Gulf of Aden, Kerry warned Tehran over its involvement in nearby Yemen, saying that the US would not tolerate Iranian military aggression.

“Iran needs to recognize that the United States is not going to stand by while the region is destabilized or while people engage in overt warfare across lines — international boundaries — in other countries,”

The secretary of state said that Washington was “well aware” of the support Iran has been giving to the Houthi rebels who drove Yemeni President Abdrabbuh Mansour Hadi out of the country.

“There are obviously supplies that have been coming from Iran. There are a number of flights every single week that have been flying in,” Kerry said.

Fighting between Houthi rebels and forces loyal to the ousted president southern Yemeni city of Aden have intensified in recent weeks as a Saudi-led coalition backed by the US has been targeting rebel positions in Yemen since the end of March.

The US secretary maintained that dealing with the regional unrest fueled by Iran must be separated from international efforts to scale back its nuclear program. Israel has urged that any nuclear deal with the Islamic Republic hinge on commitments to end its involvement in sponsoring Hezbollah, Hamas, and Houthi rebels.

Kerry said something “we’ve made clear to our friends and allies is, we can do two things at the same time.”

“We have an ability to understand that an Iran with a nuclear weapon is a greater threat than an Iran without one, and at the same time, we have an ability to be able to stand up to interference that is inappropriate or against international law, or contrary to the region’s stability and interest, and those of our friends. And we’re not looking for confrontation, obviously, but we’re not going to step away from our alliances, and our friendships, and the need to stand with those who feel threatened as the consequence of the choices that Iran might be making.”

The framework agreement reached last Thursday by US-led negotiators with Iran aims to cut significantly into Tehran’s bomb-making technology while giving the Shiite country relief from international sanctions. The commitments, if implemented, would substantially pare down Iranian nuclear assets for a decade and restrict others for an additional five years. Iran would also be subject to intrusive international inspections. The world powers have until June 30 to hammer out a final accord.