TEHRAN, Iran — As the U.S. Congress kicks off a contentious debate over the Iran nuclear accord, hard-liners in the Iranian political system are gearing up for a battle of their own, targeting a key verification provision that they hope to defeat in an open parliamentary vote.

The issue is over inspections that would be conducted by the International Atomic Energy Agency under the Non-Proliferation Treaty, the agreement on nuclear programs that Iran and 189 other countries have signed.

“Enough is enough. We will not allow spies for the U.S. and Israel to come here to gain any more from our military sites,” said Hamid-Reza Taraghi, the international affairs spokesman for the Islamic Coalition party.

Iran had accepted the provision in question, the 1997 Additional Protocol, voluntarily in 2003, and “unfortunately, a lot of information on our military activities were reported to Israel,” Taraghi said in an interview.

According to Annex 5 of the July 15 agreement Iran and six world powers reached in Vienna, Iran will provisionally apply the Additional Protocol from the day that the accord is implemented, “pending its ratification by the Majlis,” Iran’s parliament. But according to Taraghi, the Majlis “for sure” will fail to ratify it.

In and out of government, the conclusion of the lengthy talks has been warmly welcomed. Implementation will end not just sanctions that have crippled the economy but, many hope, Iran’s isolation that dates back to its 1979 Islamic revolution.

Next week the Majlis will elect a committee to examine the accords and will decide in September whether the accords are an international document to be ratified or merely an executive agreement, said Nozar Shafiee, a member of parliament.