How Istanbul mayor could pose biggest threat to Turkey's president Erdogan
Ekrem Imamoglu shook Turkish politics when he won Istanbul's mayorship, ending 25 years of domination by President Recep Tayyip Erdogan’s party.
But Turkey’s electoral board controversially ordered a run of the vote, putting Imamoglu at the center of an unprecedented political storm.
Correspondent Dorian Jones reports from Istanbul.
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