DUBAI, United Arab Emirates (AP) — Iran's hard-line former President Mahmoud Ahmadinejad registered Sunday as a possible candidate for the presidential election, seeking to regain the country's top political position after a helicopter crash killed the nation's president. The populist former leader's registration puts pressure on Supreme Leader Ayatollah Ali Khamenei. In office, Ahmadinejad openly challenged the 85-year-old cleric, and his attempt to run in 2021 was barred by authorities. The firebrand, Holocaust-questioning politician’s return comes at a time of heightened tensions between Iran and the West over Tehran’s rapidly advancing nuclear program, its arming of Russia in its war...