A parliamentary official vowed a proper response to the recent anti-Iran measures adopted by the US Congress in violation of last year's nuclear deal.
Iran negotiated the accord with six major powers a year ago to get sanctions relief in return for temporary constraints on its nuclear program.
"Iran's Majlis will respond in due course to the US Congress measures that have breached the JCPOA," Chairman of Majlis National Security and Foreign Policy Commission Alaeddin Boroujerdi was quoted as saying by IRNA on Monday.
He used the acronym for the accord's formal name, the Joint Comprehensive Plan of Action.
US Republican lawmakers, who oppose the action plan championed by President Barack Obama, have been working to prevent the full implementation of the agreement, which started in January.
In their latest attempt a week before the one-year anniversary of the deal, the Republican-led House of Representatives approved measures aimed at blocking US companies from selling commercial passenger aircraft to Tehran.
By voice vote on Thursday, US lawmakers passed two amendments directed at Chicago-based Boeing, which had offered Iranian airlines three models of new aircraft to replace the country's aging fleet.
The amendment was added to a financial services spending bill that the house cleared by a vote of 239-185, AP reported.
Another member of the Majlis commission, Masoud Goudarzi, shared Boroujerdi's critical view of the Congress, saying, "When we sign a contract with a party to the JCPOA, it means we … have a deal. If an institution in that country attempts to prevent its implementation, it will constitute a violation of the action plan."
The Obama administration is certain to veto any legislation that undermines the nuclear agreement.
Goudarzi told ISNA that the Islamic Republic will monitor the ultimate outcome of the Congress move and will act accordingly, regardless of whether the measure faces a presidential veto.
"What matters to us is the consequences of the US final decision in this relation. We reserve the right to abandon our commitments if we find that the Americans have reneged on their commitments," he said.
