US House Speaker John Boehner has criticized the United Nations Security Council for endorsing a nuclear conclusion reached between the P5+1 group and Iran, saying it would lead to “a bad deal.”

On Monday, the UNSC unanimously endorsed a draft resolution, turning into international law the Joint Comprehensive Plan of Action (JCPOA) reached between Iran and the P5+1 group – the US, Britain, France, Russia, China and Germany.

On Monday, all 15 members of the UNSC voted for the draft UN resolution in New York, setting the stage for the lifting of Security Council sanctions against Iran.

Boehner issued a statement on the same day, saying that President Barack Obama “ignored the concerns of the American people, and senior members of his own party.”

“This is a bad start for a bad deal,” he added. “The American people expect their representatives to review this potential agreement and stop Iran’s push for a nuclear weapon, and we will continue our critical work to do just that.”

The top US Republican has joined the chorus of congressional criticism for the UNSC move, adding to the bipartisan opposition to the agreement in the US.

He said that the UN endorsement of the agreement came only hours after Congress received a copy of the deal and this has undercut Washington’s “national security.”

“Enabling such a consequential vote just 24 hours after submitting the agreement documents to Congress undermines our national security and violates the spirit of the Iran Nuclear Agreement Review Act, which passed the House in May with more than 400 votes,” the House speaker said.

Iran and the P5+1 finalized the text of the JCPOA in the Austrian capital city of Vienna on July 14 after 18 days of intense negotiations and all-nighters that capped around 23 months of talks between the two sides.