Iran has delayed the naming of a successor to its slain supreme leader, Ayatollah Ali Khamenei, out of security concerns following American and Israeli comments that the new leader could also be targeted, according to two Iranian officials.Ayatollah Khamenei’s son, Mojtaba Khamenei, 56, has emerged as a top contender for the post, but concerns over his security mounted following reports in the media that he may be the new face of Iran, said the two officials, who asked not to be named to discuss sensitive issues. Once Khamenei’s name began to circulate as the favoured candidate to succeed his father, the US said he would not be acceptable and could be eliminated. “They are wasting their time,” President Trump told Axios on Thursday, adding that the former supreme leader’s son is “a lightweight” and an “unacceptable” choice. Israel’s defence minister, Israel Katz, said in a social media post on Wednesday that any leader appointed by Iran to succeed Khamenei would be “an unequivocal target for elimination.” American and Israeli strikes have so far killed Ayatollah Khamenei, and top military commanders and figures involved in defence – but not clerics. The leaders of Iran’s three branches of govt – the presidency, judiciary and parliament – are alive.If Khamenei is appointed as the top religious, political and military figure in Iran, it signals the continuity of hard-line conservative rule. Khamenei, a mysterious but influential figure who has operated in the shadows of power, has close ties to the powerful IRGC.