The newspaper cited unnamed sources as saying that while officers from the Metropolitan Police's Parliamentary and Diplomatic Protection Command could not be compelled to speak to Gray, they were "only too willing" to provide cooperation regarding her current probe into the alleged Downing Street gatherings.
The remarks come as a separate unnamed source told The Mirror that Gray "wants the inquiry to be as robust as possible" and that former Johnson aide Dominic Cummings "is going to be interviewed by the time the inquiry concludes".
"But […] there will be full transparency. He has said he will come back to the Commons and make a statement, so there will be full scrutiny", Raab told the BBC.
According to Rayner, "the Sue Gray report must be published in its entirety with all accompanying evidence". UK media outlets earlier claimed that Gray's report may not contain accompanying evidence, including emails, text messages, and transcripts of interviews, as well as the precise details pertaining to the alleged Downing Street social gathering.