Liz Truss warned not to install Johnson ally on Commons inquiry into Partygate

The Conservative leadership favourite risks a repeat of sleaze scandals' in choosing a new Tory MP for the privileges committee inquiry

Liz Truss has been warned against attempting to install an MP sympathetic to Boris Johnson on the inquiry examining whether he lied to parliament, amid concerns that the government is already trying to rein in the investigation.

It is understood that Truss, who is expected to be confirmed as the new prime minister on Monday , will have the power to put a new Tory MP on the privileges committee, which is investigating whether Johnson misled MPs over Downing Street lockdown parties.