The president, who the sectarian power-sharing system stipulates must be a Christian, is chosen by parliament. But MPs have failed in at least 26 sessions to elect one since Michel Suleiman`s term expired last year.
Aoun would like the post, but cannot muster the cross-party consensus required, and there is no sign of a credible alternative.
Meanwhile, Prime Minister Tammam Salam`s government, which groups parties at opposite ends of the political spectrum, has been largely crippled since it took office with the blessing of Iran and Saudi Arabia, which back rival Lebanese factions.
Opponents have accused Salam of usurping powers reserved for the president, and Salam has threatened to resign in frustration with the failings of his cabinet.
Meanwhile thousands have protested in Beirut in recent weeks at the government`s failure to dispose of mounds of uncollected garbage festering on Beirut`s streets.
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