Senior Boris Johnson aide Dominic Cummings faces questions over whether he has been breaking government rules to help the Tory election campaign.

The Lib Dems have written to Civil Service chief Sir Mark Sedwill, asking for assurances Mr Cummings, a senior government advisor to Boris Johnson , has not done anything to breach the code of conduct for Special Advisors.

Special Advisors are civil servants - government employees who are not supposed to get involved in party political campaigning during election periods.

Advice issued last week ahead of the election read: “Special Advisers who wish to take part in the general election campaign or help in a party headquarters or research unit during such a campaign must first resign their appointments.”

The advice also insists “those who remain in post to work on government business must ensure that they do not use official resources for party political purposes.”

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In a letter to Sir Mark, seen by the Mirror, Lib Dem Brexit spokesman Tom Brake referred to recent media reports claiming Mr Cummings had been actively involved in the Conservative Election campaign.

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BuzzFeed News yesterday reported : “Johnson’s chief aide Dominic Cummings has been in more regular communication with campaign staff over the last week, despite him initially being expected to stay in Downing Street and let CCHQ run the campaign.”

Mr Brake wrote: “I am sure you will agree, the media reports that Prime Minister’s Chief Special Adviser Dominic Cummings has potentially breached the Code of Conduct for Special Advisers are exceptionally serious and as such we would appreciate a quick response to our questions.”

(Image: Getty Images)

He asked Sir Mark to confirm:

Has Dominic Cummings has been involved in or had contact with the Conservative Party General Election Campaign and if so, can you confirm that this involvement breaches the Code of Conduct for Special Advisers?

Has Dominic Cummings used any Government resources e.g mobile or landline phones or computers to contact members of the Conservative Party General Election campaign?

Are there other Special Advisers retained by the Government during the election period and can you confirm that they have had no contact with members of the Conservative Party General Election campaign or used any Government resources in support of the Conservative Party General Election campaign?

The Conservative Party declined to comment.

Cummings has already been found in contempt of parliament for refusing to attend a Select Committee on fake news in the run up to the Brexit referendum.

The Liberal Democrats previously called for his appointment as an Advisor to Boris Johnson be blocked on grounds of suitability.