The US Senate's decision to impose new sanctions on Iran is an "unquestionable" violation of a nuclear deal reached in 2015 between Tehran and six major powers including the United States, a senior adviser to Supreme Leader Ayatollah Ali Khamenei, Ali Akbar Velayati, said.
The Senate approved on Thursday the sanctions on Iran over its ballistic missile programme and other activities not related to the international nuclear agreement.
"The U.S. Senate’s move is unquestionably in breach of both the spirit and the letter of the nuclear deal," Reuters cited Velayati as saying.
"The Iranian committee tasked with monitoring the accord will certainly examine the congressional move and come up with a decent response," he added.
According to Velayati, the US is trying to cover up the repeated defeats it has suffered from Iran in Iraq and Syria.