"The extension of sanctions by the US congress is a violation of the deal. We will report it to Iran`s committee, assigned for monitoring the implementation of the deal," according to a statement by Foreign Ministry spokesman Bahram Ghasemi read on television.
Congress members and US officials said the renewal of the Iran Sanctions Act, which was passed unanimously on Thursday, would not violate the nuclear agreement, under which Iran curbed its nuclear-power program in return for lifting sanctions.
Iran`s top authority, Supreme Leader Ayatollah Ali Khamenei, warned in November that an extension would breach the deal and threatened retaliation.
"The American government is responsible of carrying out its international commitments ... The US president has accepted to use its authority to prevent such measures," Ghasemi said, according to the state news agency IRNA.
The ISA will expire on Dec. 31 if not renewed. The White House had not pushed for an extension, but had not raised serious objections. Some congressional aides said they expected President Barack Obama to sign it.
US President-elect Donald Trump railed against the deal during his campaign for the White House.
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