Conservative MP Alexander Stafford, a former ministerial aide to Mr Johnson, said the appointment "doesn't pass the sniff test".
"It really undermines the work that she's done, undermines the civil service and really puts in question Sir Keir's complete judgement," he added.
Former minister Jacob Rees-Mogg, a cabinet minister under Mr Johnson, has said Ms Gray's Partygate conclusions now looked "like a left-wing stitch up".
Tories frothing at the mouth in a hypocritical shout of questioning ethics.
https://www.bbc.co.uk/news/uk-politics-64834134
Conservative MP Alexander Stafford, a former ministerial aide to Mr Johnson, said the appointment "doesn't pass the sniff test".
"It really undermines the work that she's done, undermines the civil service and really puts in question Sir Keir's complete judgement," he added.
Former minister Jacob Rees-Mogg, a cabinet minister under Mr Johnson, has said Ms Gray's Partygate conclusions now looked "like a left-wing stitch up".