The leaders of all but one of Greece's main political parties are to hold a live televised debate for the first time in six years ahead of the country's Sept. 20 early election.

The debate later Wednesday between seven politicians will be held at the state-run ERT television channel. Questions from six Greek TV journalists will be grouped into segments on the economy, education and health, migration and foreign policy. The politicians can also ask their rivals one question.

The Nazi-inspired Golden Dawn party has complained it has not been invited to the debate, despite being the third-largest party in opinion polls ahead of the election.

Former Prime Minister Alexis Tsipras called the vote barely eight months into his four-year term after signing a third bailout deal with creditors.