Iran's ambassador to Britain, Hamid Baeidinejad, said that it is impossible to renegotiate the 2015 Iran nuclear deal, also known as Joint Comprehensive Plan of Action (JCPOA), Press TV reported on Thursday.

"The aspiration ... is that we keep the Iran nuclear deal alive and give time to the U.S. to rethink and revise its position," Baeidinejad, also an Iranian nuclear negotiator, was quoted as saying.

He emphasized that the idea of changing or renegotiating the nuclear deal would be "impossible," he said, reasoning that if any part in the deal is changed, other aspects of the deal will either be changed or compromised.

"We are trying very hard ... to find mechanisms that this deal could (still) be effectively implemented," he added.

The U.S. President Donald Trump decided to quit the historic Iran nuclear deal on May 8 and urged the signatories to the deal for renegotiation of the accord.