Turkey's Prime Minister Binali Yildirim addresses members of parliament from his ruling AK Party (AKP) during a meeting at the Turkish parliament in Ankara, Turkey, November 8, 2016. REUTERS/Umit Bektas - RTX2SH3M

ISTANBUL (Reuters) - Turkey’s high electoral board is expected to announce the date this week of a referendum on constitutional changes that would extend the powers of the presidency, Turkish Prime Minister Binali Yildirim said on Wednesday.

The referendum is likely to be held sometime between April 1 and April 20, Yildirim told a meeting of officials from the ruling AK Party.

“I believe the president will approve it this week and a concrete date will be set,” he said.