Erdogan accuses opposition of working with Biden

Turkish President Tayyip Erdogan held his last election rallies in Istanbul on Saturday, accusing the opposition of working with U.S. President Joe Biden to topple him while making a final appeal ahead of the biggest challenge to his 20-year rule.

Polls show Erdogan trailing the main opposition candidate Kemal Kilicdaroglu a day ahead of one of the most significant elections in Turkey's modern history. However, if neither of them win more than 50 percent of the vote and secure an outright win, the vote will go to a runoff on May 28.

Voters will also elect a new parliament, likely a tight race between the People's Alliance comprising Erdogan's conservative Islamist-rooted AK Party (AKP) and the nationalist MHP and others, and Kilicdaroglu's Nation Alliance formed of six opposition parties, including his secularist Republican People's Party (CHP), established by Turkey's founder Mustafa Kemal Ataturk.

Polls will open at 8 a.m. (0500 GMT) and close at 5 p.m. (1400 GMT). By late on Sunday there could be a good indication of whether there will be a runoff vote for the presidency.

Erdogan's campaign over the past month has focused on his government's achievements in the defence industry and infrastructure projects, and his assertion that the opposition would roll back such developments.