By Paul Kirby in The British Broadcasting Corporation (BBC). Here is an extract:

He is facing his stiffest challenge yet from six opposition parties who have combined forces for presidential and parliamentary elections on 14 May.

Turkey faces soaring inflation and is reeling from twin earthquakes that have left 50,000 people dead. Mr Erdogan and his ruling AK Party say they will bring inflation down to single figures, a commitment already made by their opponents.

Turkey has become increasingly authoritarian under President Erdogan and the opposition is seeking to reverse that.

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