Boris Johnson re-selected for Uxbridge seat
The seat is seen as a target for Labour at the next election.
The seat is seen as a target for Labour at the next election.
Ethan Pugh, who was set to stand in Darlington Borough Council's upcoming local elections, said his comment was "insensitive, unnecessary and irresponsible".
Ms Gray, who received national prominence for her role investigating lockdown-breaking parties in Downing Street, will become Sir Keir's chief of staff.