Obama says still a 'big gap' in Iran nuclear negotiations
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US President Barack Obama said a "big gap" remains in international nuclear negotiations with Iran and he questioned whether talks would succeed.
"Are we going to be able to close this final gap so that (Iran) can reenter the international community, sanctions can be slowly reduced and we have verifiable, lock tight assurances that they can't develop a nuclear weapon," Obama told CBS News in an interview broadcast Sunday.
