Mr Johnson sacked his Government appointed lawyers on Wednesday after it emerged that he had been reported to the police over more claims he broke Covid rules.
Officials passed on evidence that he handed over to them, including his diaries from the time, which allegedly showed he hosted family and friends at Chequers.
Allies of the former prime minister said he had lost confidence in his legal team and was now assembling a new one, which will also be funded by the taxpayer.
Thames Valley Police confirmed it had “received a report of potential breaches” at the grace and favour home.
The Met also released a statement saying it was looking at further possible rule breaking that occurred in Downing Street.
The former prime minister’s office said suggestions he had broken lockdown regulations were “totally untrue” and he was not contacted before the referral was made.
It suggested the move was a “politically motivated stitch-up” to lengthen the Privileges Committee inquiry into whether Mr Johnson misled Parliament over ‘Partygate’.
Warnings of a witch hunt
A Tory source said it was a “witch hunt against Right-wingers” that had also taken in Suella Braverman, the Home Secretary, and Dominic Raab, the former deputy prime minister.
“Unless the leadership acts to stop it and shows support for Boris, Suella and Raab there will be action against the leadership,” the source told The Telegraph.
Mr Johnson’s allies rallied to his defence. Marco Longhi, the MP for Dudley North, claimed civil servants who “cannot abide Brexit” were behind the attacks.
Ben Bradley, the MP for Mansfield, warned that the former prime minister was “still in the firing line” of “various forces around the country”.
One ally suggested Nadine Dorries, Nigel Adams and Alok Sharma, who are all expected to be in Mr Johnson’s final honours list, could step down as MPs early.
That would trigger three by-elections, causing a major political headache for Mr Sunak. Mr Adams dismissed any suggestion he was preparing to resign.
Downing Street insisted there was no political stitch-up and that “ministers played no role in deciding whether the information should be handed over to the police”.
Alex Chalk, the Justice Secretary, defended civil servants who referred the information to the police, saying they were right to do so if they thought it was evidence of rule breaking.
“If they had sat on it then people would have criticised them for that – if they had passed it on, others would criticise,” he said.
The Cabinet Office said civil service rules obliged officials to pass on the documents.
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