Hacked voicemails released by WikiLeaks have revealed how Democratic Party donors tried to persuade senior officials to ditch Bernie Sanders.

Calls left with senior figures reveal that supporters were actively lobbying for Sanders to be dropped from the convention.

Furious donors demanded Sanders be dropped, calling him 'the worst person in the world' and an 'a**hole' as they accused him of trashing the party.

The leaked messages are the latest embarrassment for the party establishment after Democratic National Committee chairwoman Debbie Wasserman Schultz was forced to resign after hacked emails showed she and other officials tried to derail Sanders' campaign.

Scroll down to listen to the voicemails

Hacked voicemails released by WikiLeaks have revealed how Democratic Party donors tried to persuade senior officials to ditch Bernie Sanders

One of the voicemails - from an Arizona dialling code - captures an irate woman demanding the party take action against Sanders.

'I am one of the many Democrats that is so angry at Bernie Sanders ... he is trying to change everything - change the rules,' the donor says.

'You guys are acquiescing to him on things at the convention. I don't think he should get a speaking spot at the convention.'

Calling the Vermont senator 'asinine', she adds: 'Do not let him rule the Democratic Party. He's not a Democrat! Please stop this man now.'

The same woman is captured in another phone call from the same number, saying she is 'furious about what you are doing for Bernie Sanders'.

'He is getting way too much influence,' she says.

Democratic National Committee chairwoman Debbie Wasserman Schultz was forced to resign after hacked emails showed she and other officials tried to derail Sanders' campaign

'I am on fixed income and I spent over $300 donated to Hillary, and what I see is the DNC bending over backwards for Bernie.

'Bernie is the worst person in the world even to be running in a Democratic Party because he is not a Democrat. Please don’t give into him.

'I don’t care about Sanders supporters, most of them are going to vote for Hillary anyway.

'Quit acquiescing to this person who likes to play the victim card, and who also has been attacking Hillary which gives Trump all his talking points.'

In a final threat, she adds: 'I will leave the Democratic Party if the Democratic Party continues to coddle Bernie Sanders. Get rid of the a**hole.'

Another call criticized the party for allowing Sanders to elevate one of his key supporters, Cornel West, to the DNC's platform committee.

'He’s called President Obama a "n****rized president' and he said he’s a ‘Republican in blackface’,' the woman rages.

'Why does the DNC allow such trash to be on the platform committee? I don’t understand it - you guys are losing me.'

The leak also revealed the access donors are granted to President Obama and Vice President Joe Biden

Other calls reveal the access donors are given to President Obama, Vice President Joe Biden and the First Lady.

One caller complains that they have been invited for a St Patrick's day breakfast with the vice president not to a White House reception.

Another man says Wasserman Schultz offered him and his wife the opportunity to attend a 'small dinner with President Obama this week'.

A separate call that was among the leaked files asks for the best contact details for Michelle Obama, concerning an invitation to an event.