"We are not going to get into the United States' internal affairs and we consider the US government responsible to carry out the commitments it would undertake should there be an agreement (on Iran’s nuclear energy program)," Zarif said on Monday.
He reiterated that the US Congress bills do not relieve Washington from its commitments in a possible nuclear deal and that, based on its international undertakings, the US administration ought to eliminate any effects Congress bills might have on implementation of the deal.
The Iranian top diplomat also stressed that Tehran pursues the nuclear talks seriously.
His comments came after the US Senate on Thursday overwhelmingly passed a piece of legislation which will make it possible for Congress to review and potentially reject a final deal with Iran.
The bill gives Congress 30 days to review a final nuclear deal after Iran and the Group 5+1 countries (Russia, China, the US, France, Britain and Germany) reach such an agreement, and during that time bars President Barack Obama from temporarily waiving any US sanctions on Iran that were passed by Congress.
Tehran and the G5+1 (also P5+1 or E3+3) reached a mutual understanding on the parameters of a comprehensive agreement over the Islamic Republic’s nuclear program in Lausanne, Switzerland, on April 2.
The two sides have agreed to finalize a comprehensive deal on Tehran’s civilian nuclear program by the end of June.
The next round of talks between Iran and the sextet is set to begin in Austria's capital of Vienna on Tuesday, with the two sides’ negotiators resuming work to draft the text of a comprehensive nuclear deal.