Tehran has rejected new US plans to impose economic sanctions on Iran over its nuclear programme.
Iranian President Hassan Rouhani’s administration said it was against any such move, according to state media.
“The Iranian government rejects the United States’ unilateral moves and will never accept them,” a statement on the Iranian state news agency IRNA said on Saturday.
“This is an important development and will have a negative impact on the bilateral relations.”
The US imposed economic sanctions earlier this month on Iran after it failed to curb its nuclear work, but Iran has rejected the measures as part of an effort to bolster its influence in the region.
Iran has been under US pressure for more than a decade to halt its nuclear development.
Washington says it is targeting the Islamic republic over its alleged nuclear weapons programme.