A rally held by the Turkish President's main rival has been blacked out by state broadcasters after he dared Erdogan to 'confront him' in a TV debate.

Recep Tayyip Erdogan', 64, is standing for re-election in tomorrow's presidential vote that could cement Turkey's switch from a parliamentary to a presidential system, which was narrowly approved in a referendum last year.

At a mass rally in the city of Ankara yesterday, Muharrem Ince, a fiery lawmaker from the opposing secular Republican People's Party (CHP) had a message for Erodgan.

'Tomorrow is the last evening. If you have the courage, confront me,' he said.

But as he began his speech at another event in Istanbul today he was handed a note saying the broadcast of the rally was 'down' on a state TV channel, which he quickly branded 'sabotage' on Edrogan's part.

Hundreds of thousand of supporters of Muharrem Ince, the main presidential candidate facing Erdogan,

Recep Tayyip Erdogan held his own rally for the AK Party in the Esenyurt district of Istanbul

Muharrem Ince waving to supporters at a rally in Ankara, where he challenged Erdogan to a television debate

This week Erdogan said he wants to become Turkey's 'grandmaster' and help his country become one of the world's top powers if re-elected for a four term as the nation's leader.

But this time he is facing more robust opposition figures and parties cooperating with each other in an anti-Erdogan alliance.

Ince has held three rallies in three days in the cities of Ankara and Izmir.

Throwing down the gauntlet to the President, Ince said: 'Look, that's my last proposal to you. If you want, I can even cancel my Istanbul rally for you. Come, confront me, let's debate on tv.'

The event was the second giant rally the opposition leader addressed within the space of two days.

And he is due to hold another rally in Istanbul on Saturday.

Pictured: President Erdogan is seeking a fourth term as Turkey's president, but has so far avoided taking part in any TV debates

Erdogan at a rally of his own supporters this week in the city of Kahramanmaras. He has so far refused to take part in television debates during the election

Erdogan, a favourite to win the presidential polls, has in the past rejected the opposition candidate's proposal for a television debate, saying that 'I don't want anyone to get points through me'.

Ince has injected a breath of fresh air into the presidential campaign with his dynamism and oratorical skills comparable to those of Erdogan.

Many analysts say he could force the president into a second run-off on July 8.

In Ankara, Ince accused the state-run Anadolu news agency and TRT television of committing a 'constitutional crime' for failing to be even-handed.

'TRT aired Erdogan for 181 hours, Muharrem Ince for 15 hours,' he said.