TEHRAN (Reuters/AFP) - Iranian President Mahmoud Ahmadinejad registered on Friday as a candidate in Irans June presidential election, the semi-official Fars News Agency reported. A senior aide had told Reuters in January that the conservative politician would seek a second four-year term, but Ahmadinejad had not himself confirmed his election plans until now. Irans Press TV said Ahmadinejad was at the Interior Ministry registration centre to officially sign up as an election candidate. Meanwhile, the ex-chief of Irans powerful Revolutionary Guards Corps, Mohsen Rezai, formally registered his candidacy on Friday for the June 12 presidential vote, the official IRNA news agency reported. Rezai, who headed the Revolutionary Guards Corps for 16 years until 1997, is the first conservative to challenge incumbent President Mahmoud Ahmadinejad who is yet to formally seek a second term. He is also the first of four main prospective candidates to formally register for the presidency. Former parliament speaker and reformist cleric Mehdi Karroubi and former prime minister Mir Hossein Mousavi, also a reformist, have announced they plan to contest the presidency while Ahmadinejad has set up a campaign team for the election but has not publicly said he will run. Rezai, critical of the policies adopted by Ahmadinejad, has promised to tackle poverty, high prices and unemployment, which he considers are the main problems facing Iran. He was appointed by Irans late leader Ayatollah Ruhollah Khomeini as the head of the Revolutionary Guards in 1981 when he was only 27 years old and led the corps during the bloody eight-year war with Iraq. Since 1997 the veteran conservative, who holds a PhD in economics, has been the secretary of Irans top arbitration body, the Expediency Council. Rezai is among five leading Iranian officials wanted by Argentina for their alleged roles in a 1994 bombing against a Jewish organisation that killed 85 people.