By NICK ALLEN, US NEWS EDITOR (POLITICS) Published: 20:05 EST, 3 March 2026 | Updated: 20:20 EST, 3 March 2026 Mojtaba Khamenei, the favorite to become the new Supreme Leader of Iran, was repeatedly treated for impotency at hospitals in the UK, according to a secret US intelligence document.On Tuesday, Mojtaba, 56, was reportedly preparing to be named successor to his father Ali Khamenei, who was killed along with 48 other senior regime officials in America and Israel's ongoing Operation Epic Fury.According to a classified briefing sent by the State Department to the US Embassy in London in 2008, and later…