Kirby made the remarks during his press briefing on Tuesday.
His remarks came amid criticisms by experts and lawmakers about the administration’s reported openness to grant Iran additional, non-nuclear sanctions relief and access to US financial markets, the Tower Magazine wrote.
Critics argue that such a move would endanger the global financial system and cause a collapse of the sanctions regime against Iran.
Previously, the White House wrote that 'non-nuclear sanctions must remain in effect and be vigorously enforced.'
Iran and the six world powers reached a landmark nuclear agreement, known as the Joint Comprehensive Plan of Action) on July 14, 2015.
When Iran's peaceful nuclear program was verified by the International Atomic Energy Agency (IAEA), 'Implementation Day' of the JCPOA was announced and anti-Iran sanctions were lifted on January 16, 2016.
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Tehran, March 31, IRNA – The US State Department spokesperson John Kirby said the US administration intends to meet all its 'commitments and obligations 'under the nuclear deal with Iran.