Turkish President Tayyip Erdogan has nurtured an image of a robust and invincible leader over his two decades in power, yet he appears vulnerable as the political landscape may be shifting in favour of his opponent in Sunday's presidential vote.
Erdogan emerged from humble roots to rule for 20 years and redraw Turkey's domestic, economic, security and foreign policy, rivalling historic leader Mustafa Kemal Ataturk who founded modern Turkey a century ago.
