Britain's top civil servant has been ordered to reveal to MPs the evidence that got Gavin Williamson kicked out of the Government over a leak of secret information about Chinese tech giant Huawei.

Cabinet Secretary Sir Mark Sedwill has been told to hand over information about the security breach to the Joint Committee on the National Security Strategy.

The request, contained in a letter from committee chairwoman Dame Margaret Beckett looks likely to set up a new row with the Government, which has so far refused to reveal the details of the probe with got Mr Williamson fired on Wednesday.

In a letter to Sir Mark, Dame Margaret said: 'The committee notes your ongoing inquiry into the leak of the National Security Council's decision on the use of Huawei in the UK's 5G telecommunications network.

'As this directly pertains to our work in scrutinising the NSC, the committee would like to be apprised of the outcomes of this leak inquiry once it is complete.'

Cabinet Secretary Sir Mark Sedwill has been told to hand over information about the security breach to the Joint Committee on the National Security Strategy.

Gavin Williamson was spotted out and about in the Yorkshire town of Scarborough today

The request was made in an almost throwaway last paragraph of a letter to Sir Mark sent yesterday, but published today

In the letter to Sir Mark, Dame Margaret said: 'The committee would like to be apprised of the outcomes of this leak inquiry once it is complete'

Theresa May is facing a major backlash from furious Tory MPs over her 'crackers' decision to fire Gavin Williamson as defence secretary just days before a key local election.

The Prime Minister was warned that Mr Williamson - who continues to protest his innocence - will seek revenge for the way he was unceremoniously booted out of Government.

Mr Williamson, a former Tory whip, helped run Theresa May's successful leadership campaign, was rewarded for that role with this surprise promotion to replace Michael Fallon in November 2017.

But he was fired by the Prime Minister on Wednesday after an inquiry into a leak to the Daily Telegraph of information about the Chinese tech giant from the National Security Council meeting pinned the blame on him.

'Gavin knows where the bodies are buried — because he buried them himself,' a Tory source told The Times.

Theresa May has been warned that Mr Williamson could seek revenge for the way he was kicked out of the Government over a leak of information about Huawei

Mr Williamson took to Instagram yesterday, saying it had been a 'tough week'

A Tory MP told the paper the decision to fire him days before the local elections, in which the Tories are on course to take a humiliating drubbing from voters, was 'crackers'.

He added that it showed Mrs May was 'in the bunker without any shred of political intelligence left'.

It came as it was reported that Donald Trump's secretary of state is to warn Mrs May against giving Huawei access to Britain's 5G networks.

Mike Pompeo will tell the Prime Minister that the Chinese technology company poses a security risk to Britain.

US secretary of state Mike Pompeo will tell the Prime Minister that Huawei poses a security risk to Britain

The former head of the CIA will meet Mrs May and Jeremy Hunt, the Foreign Secretary, in London next Wednesday.

He will also deliver a speech on the state of the UK-US 'special relationship'.

A US State Department official said Mr Pompeo would make it clear that giving Huawei access to networks could endanger US-UK technology partnerships, The Daily Telegraph reported.

The source said: 'What we want to do with friends, allies, partners on this issue is share with them the things we know about the risks that the presence of Huawei and their networks present.

'We see that as imperative, the risk to their own people, to the loss of privacy protections, the risk that China will use the data in a way that's not in the best interests of their country.'

The Prime Minister's decision to give Huawei limited access to Britain's 5G network has put renewed strain on the relationship with Washington.

The White House has been lobbying European allies against letting the firm into its networks, fearing that the Chinese government has significant control over Huawei, despite its denials.