Turkish President Recep Tayyip Erdogan's ruling Justice and Development Party is losing voters in major cities across the country.

Compared to the 2018 elections, the Justice and Development Party's vote share has dropped by more than 10 percentage points in Istanbul, the capital Ankara, the western city of Bursa, the industrial center of Kocaeli and the Black Sea cities of Trabzon and Rize, according to an opinion poll, Ahval reported.

Erdogan's government is trying to bolster its public support after the fall in the value of the lira and a loosening of monetary policy that has led to a sharp rise in the cost of living for Turkish voters. Annual inflation reached 79.6 percent last month, the highest in more than two decades. The country is due to hold presidential and parliamentary elections next June.

According to an August opinion poll conducted by ORC Arastırma, the ruling party's vote share in Istanbul, the country's largest city, dropped 12.5 percentage points to 30.2 percent from four years ago.

In Kocaeli, the center of industrial production, support for the Justice and Development Party dropped 13.2 percentage points to 35.1 percent, and in Ankara it dropped 10.3 percent to 30.1 percent.

In Trabzon and Rize, which are considered political strongholds of the ruling party, losses exceeded 15 percentage points.