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David Cameron’s former strategy chief called for Theresa May to resign as he launched a scathing attack on the Prime Minister’s record on terrorism.

Steve Hilton, who worked under the former Prime Minister in 10 Downing Street, criticised Mrs May’s record on security after the third terror attack in Britain in 10 weeks.

Alluding to the PM’s time as Home Secretary between 2010 and 2016, Mr Hilton tweeted: “Theresa May responsible for security failures of London Bridge, Manchester, Westminster Bridge. Should be resigning not seeking re-election”.

Quoting a newspaper report which suggested that Mrs May was trying to send a tougher message to security services, Mr Hilton added: “Theresa May blame-shifting again. her spin doctors attack MI5, but she was in charge of them for years...”

Mr Hilton worked for Mr Cameron during the Coalition government after the 2010 election, before spending a year as a visiting scholar at Stanford University in California.

Mrs May also faced criticism from Jeremy Corbyn over her record on terror, as the Labour leader accused the PM of cutting resources.

Citing a notorious confrontation between the PM and the Police Federation, which represents officers across the country, Mr Corbyn said: “Theresa May was warned by the Police Federation but she accused them of 'crying wolf'.”

He added: “You cannot protect the public on the cheap. The police and security services must get the resources they need, not 20,000 police cuts.”

Mr Corbyn also said that the PM must also be ready to have difficult discussions with close ally and major arms customer Saudi Arabia about terror funding.

He cited the delayed publication of an investigation commissioned by David Cameron into the foreign funding of extremist Islamist groups, which is reported to focus on the Gulf kingdom.

"We do need to have some difficult conversations, starting with Saudi Arabia and other Gulf states that have funded and fuelled extremist ideology," said Mr Corbyn.

The Prime Minister said “enough is enough” after the attack in which seven people were killed and 21 were left fighting for life.

"As terrorism breeds terrorism and perpetrators are inspired to attack, not only on the basis of carefully constructed plots after years of planning and training, and not even as lone attackers radicalised online, but by copying one another and often using the crudest of means of attack,” she said.

She announced more needed to be done to clampdown on extremist “safe spaces” both online and in Britain’s communities.

Mrs May also claimed there was "far too much tolerance of extremism in our country" and called for it to be tackled head on, while reviewing the country's counter-terrorism strategy to combat the changing threat.