The former prime minister has been criticised for a luxury holiday and his son's private schooling

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Mr Tsipras also prompted a media frenzy when his eldest son was enrolled at one of Greece's most prestigious and expensive private schools.

The politician who rode to power on an anti-austerity campaign sparked outrage after it emerged he spent a summer holiday in a wealthy superpower's villa, commuting by helicopter.

Revelations of the Syriza leader's lavish lifestyle as debt-ridden Greece continues to struggle have undermined his attempt to return to power, provoking fierce discontent over his leadership.

Syriza was currently running neck-and-neck in the polls with the conservative New Democratic party as Mr Tsipras addressed a final election rally in Athens on Friday night.

As the ballot approaches - Greece's fifth election in six years - the former prime minister has struggle to rally disillusioned supporters who are questioning his leadership.

Some senior party leaders call him a "lone wolf" who prefers to lead with a small cadre in his executive office and who is detached from the majority of the party and its grass-roots.

Nassos Iliopoulos, a member of Syriza's political secretariat, said: "We have had five years' worth of politics in nine months. And he has been at the centre of all that."

Even his own supporters are beginning to see Mr Tsipras as a politician first and a radical revolutionary second.

The leader, who has been accused of being egoist, did not help matters after he posted on Twitter a cartoon of himself as the messiah, with the caption: "There will not be any miracles if you abstain."

A former Syriza MP said: "Coming to power changed everything. The prime minster and his team stepped aside from the party. They stopped the collective processes."