Trump choice for secretary of defense says US should respect JCPOA

'When America gives her word, we have to live up to it,' Mattis said while expressing his view about the landmark nuclear agreement in an address to a meeting with the US Senate Armed Services Committee on Thursday, Western media reported.

JCPOA was signed in 2015 between Iran and the world six major states ending more than a decade of dispute about Iran's peaceful nuclear program.

Iran has repeatedly announced that its nuclear activities aim at generating power and for medical uses.

Power transition in the US will take place on January 20 when the 45th American President Donald Trump takes office.

Winning the electoral vote on November 8, Trump was elected as the next US president while his rival Hillary Clinton won the popular vote.

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