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Furious demands for the resignation of David Cameron grew overnight, following his sensational admission that he had £30,000 stashed away in his Dad's tax haven.

The hashtag #ResignCameron is the number one trend on Twitter at the time of writing, with MPs, celebrities and furious Brits calling for the PM to step down.

Fugitive whistleblower Edward Snowden led the charge last night, within hours of the Prime Minister coming clean about the offshore trust.

And support for a protest planned for Saturday outside Downing Street is gaining momentum.

Here's how it developed, and who's calling for David Cameron to go.

Edward Snowden

(Image: Reuters)

In a series of tweets, Mr Snowden , said the next 24 hours "could change Britain."

He suggested the outrage at Mr Cameron's admission that he trousered thousands in profits from his father's offshore fund could spark the same kind of protests that yesterday forced Icelandic PM Sigmundur David Gunnlaugsson to quit.

An estimated 10% of Icelandic voters took to the streets on Tuesday night, furious at the revelation that Mr Gunnlaugsson had hidden millions in an offshore fund.

Mr Snowden tweeted: "It's up to the British people, not us. In Iceland, 10% of all voters were in the streets within 24 hours, and for less."

Responding to people on Twitter saying they "hope Cameron resigns," he said: "With respect, hope is not a strategy."

Read more:Edward Snowden urges British public to take to the streets

John Mann MP

(Image: Getty)

Labour MP John Mann said: “Cameron has been less than honest. He should resign immediately.

“Most decent people would expect nothing less.”

Tom Watson MP

(Image: PA)

Labour Deputy Leader Tom Watson said the PM should pay back all the profits he has made the Treasury immediately.

“The Prime Minister has previously described the actions of others who invested in these complex schemes as ‘morally wrong’,” Mr Watson said.

I’m sure he will now consider voluntarily paying the money that, in his own words, should morally belong to the Exchequer.”

He later told Sky News: "He may have to resign over this."

Lily Allen

(Image: Getty)

Lily Allen has joined people calling for David Cameron to resign after admitting he profited from his father's offshore trust.

The outspoken pop star insisted it is "very important" that he steps down from his position after revealing he owned thousands of shares with wife Sam, which he flogged for £30,000 just weeks before he became Prime Minister .

The singer took to Twitter, urging her 5.79 million followers: "Our Prime Minister has been stealing from us. It's very important that he resigns."

Read more:Lily Allen calls for David Cameron to resign