The US vote giving Congress the right to review any nuclear deal with Iran is part of a "psychological war" against Tehran's negotiators, an Iranian official said on Friday.

"Americans in this game have given Congress this role to overview the agreement so in the talks they can pressure our nuclear negotiating team," said Esmail Kosari, a member of parliament's national security and foreign affairs committee, quoted by Fars news agency.

With an agreement targeted by the end of next month, "they have no choice but to lift the sanctions, they create this new game by Congress to wage a psychological war," he said.

The US Senate on Thursday passed legislation giving Congress the right to review and perhaps even reject any nuclear deal between world powers and Iran.

The new law comes amid intense negotiations on a deal intended to prevent Tehran's development of a nuclear weapon in exchange for lifting of economic sanctions.

Negotiations seeking a definitive accord on Iran's nuclear programme are to resume on Tuesday in the Austrian capital.

Iran and the P5+1 -- the five permanent members of the UN Security Council plus Germany -- aim to turn a framework accord reached in Switzerland on April 2 into a full agreement by June 30.

The Islamic republic's conservative-dominated parliament is also working on legislation giving it the right to ratify any nuclear deal struck with world powers.