Donald Trump
Donald TrumpReuters

Republican presidential nominee Donald Trump's campaign on Thursday criticized the Iran nuclear deal and Democratic nominee Hillary Clinton's support for it, after a Reuters report revealed that the United States and its negotiating partners agreed "in secret" to allow Iran to evade some restrictions.

The news agency earlier cited a soon-to-be-published report by the Institute for Science and International Security, which said the U.S. and fellow negotiating partners secretly agreed to permit the Islamic Republic to ignore some restrictions on its nuclear program, thereby paving the way for the removal of economic sanctions against the rogue state.

The report cites government officials who participated in the negotiation process prior to the signing of the deal last July.

Retired Lieutenant General Michael Flynn, a Trump foreign policy adviser, said in a statement quoted by Reuters that the report showed President Barack Obama "gave away the store" when the agreement was sealed last year.

"The deeply flawed nuclear deal Hillary Clinton secretly spearheaded with Iran looks worse and worse by the day," Flynn’s statement said, referring to Clinton's role during Obama's first term as secretary of state.

Trump has been consistent in his criticism of the nuclear deal, which he has labelled as “disastrous”.

The Republican nominee has vowed to block the nuclear deal and to prevent Iran from acquiring an atomic weapon if he is elected in November.