Donald Trump plans to announce while on his trip to Saudi Arabia next week that the US will now refer to the Arabian Gulf or the Gulf of Arabia rather than the Persian Gulf.

The move has prompted outrage from Iranian leaders, and last-minute efforts are being made to persuade Trump to pull back from offending Iran in the midst of vital talks on the future of the Iranian nuclear programme. “If Trump went ahead with the proposal he would manage to unite every Iranian, pro- or anti-regime, against him, and that is a near impossible achievement,” one diplomat said.

The Iranian foreign minister, Abbas Araghchi, said he hoped the absurd rumour about a name change was disinformation, adding that names of Middle East waterways did “not imply ownership by any particular nation, but rather reflects a shared respect for the collective heritage of humanity”.

“The name Persian Gulf, like many geographical designations, is deeply rooted in human history. Iran has never objected to the use of names such as the Sea of Oman, Indian Ocean, Arabian Sea or Red Sea. In contrast, politically motivated attempts to alter the historically established name of the Persian Gulf are indicative of hostile intent toward Iran and its people, and are firmly condemned. Such biased actions are an affront to all Iranians, regardless of their background or place of residence.