A West Yorkshire MP has said the Prime Minister needs to "show some leadership and judgment" over the Andrew Mitchell incident.
Yvette Cooper, Labour's Shadow Home Secretary, said David Cameron should make Mr Mitchell stand down as Chief Whip "straight away".
It follows claims he called police officers "plebs" after they made him wheel his bike out of Downing Street's pedestrian exit instead of opening the main gate.
He has apologised to the officers but has denied using the word "plebs".
Defence Secretary Phillip Hammond said the row had been "hijacked".
We urged David Cameron and Andrew Mitchell to properly deal with this incident from the start. Instead the drawn out saga of half apology and oblique denial has left a cloud hanging over the Government's attitude to public servants.
It is now very hard for the Chief Whip to command respect in Parliament or beyond.
The Prime Minister needs now to show some leadership and judgement and take seriously the message this incident has sent to people across the country about his Government. He needs to end this now and make Andrew Mitchell stand down as Chief Whip straight away.
England should have a 'regional government for the North', a West Yorkshire MP has claimed.
MPs from the region have clashed in the Commons over calls to allow 16 and 17-year-olds to vote.
Ministers deny claims by a Yorkshire MP that talks aimed at securing affordable insurance cover for flood risk homes are 'in disarray'.