The allegations relate to the deputy PM’s previous tenure as justice secretary, Downing Street says.
Image source, PA MediaFive further complaints about Dominic Raab’s behaviour as a minister are being investigated, No 10 has said.
The prime minister’s official spokesman said the claims related to Mr Raab’s previous tenure as justice secretary.
It means a total of eight complaints are now being investigated by senior lawyer Adam Tolley KC.
Mr Raab, who was reappointed by Rishi Sunak as justice secretary and deputy prime minister in October, has denied allegations of bullying.
A source close to Mr Raab said: “There is zero tolerance for bullying across the civil service. The deputy prime minister leads a professional department, driving forward major reforms, where civil servants are valued and the level of ambition is high.
“There is an independent investigation under way that is being overseen by the Cabinet Office, and it would be inappropriate to comment further on issues relating to it until it is completed.”
The MP for Esher and Walton previously served as justice secretary and deputy prime minister under Boris Johnson.
A close ally of Mr Sunak, Mr Raab was sacked from those roles when Liz Truss became prime minister in September.
The three complaints already under investigation related to his time as foreign secretary and Brexit secretary, as well as at the Ministry of Justice.
Labour leader Sir Keir Starmer said it was “pretty shocking” that no action had been taken against Mr Raab and called for him to be suspended.
He said it was “a consequence of having a weak prime minister” that Mr Raab continued to serve in government while complaints about his behaviour were investigated.
Asked how Mr Raab could remain in his cabinet role considering the allegations against him, the prime minister’s official spokesman said: “We think it’s right there is an independent process, that the investigator looks into these claims thoroughly before coming to a view.”
He added that the investigation would be concluded “swiftly”.
Mr Tolley, a commercial and employment law specialist, was appointed by the prime minister to investigate complaints against Mr Raab in November.
Mr Tolley was chosen to lead the investigation because the role of adviser on ministers’ interests has been vacant since Lord Geidt’s resignation in June.