Obama - Verification regime necessary for Iran nuclear deal

Iranian President Hassan Rouhani leaves after delivering a speech at plenary session during the Asian African Conference in Jakarta April 22, 2015. REUTERS/Beawiharta/Files

WASHINGTON (Reuters) - U.S. President Barack Obama acknowledged on Tuesday that Iranian negotiators have talked about backtracking from a framework agreement on its nuclear program, endangering ongoing negotiations to finalise the deal.

"There has been a lot of talk on the other side from the Iranian negotiators about whether, in fact, they can abide by some of the terms that came up in Lausanne," Obama said at a news conference, referring to the framework deal reached in the Swiss city in April.