Lord Sewel is facing a police inquiry after quitting as House of Lords deputy speaker over a video allegedly showing him taking drugs with prostitutes.
Lords Speaker Baroness D’Souza said he had also quit as chairman of the Lords privileges and conduct committee in the wake of the Sun on Sunday’s story.
The footage showed him snorting powder from a woman’s breasts with a £5 note.
Baroness D’Souza said his behaviour was “shocking and unacceptable” and that she was referring him to the police.
“Lord Sewel has this morning resigned as chairman of committees. The House of Lords will continue to uphold standards in public life and will not tolerate departure from these standards,” she said.
“These serious allegations will be referred to the House of Lords commissioner for standards and the Metropolitan Police for investigation as a matter of urgency.”
In the footage, Lord Sewel, who is married, also discusses the Lords’ allowances system.
The peer is yet to comment on the claims.