Members of the Commons health committee were among MPs and peers who signed up to the safe staffing campaign at a reception at the Houses of Parliament.
Andrew George MP, a member of the health committee, hosted the event and told a packed room: 'An organisation can have the most sophisticated culture and leadership, but if they do not have enough nurses on the front line, those count for nothing.'
Mr George said he was committed to putting nurse staffing levels higher up the committee's agenda.
Photographs from the event
From left: Florence Nightingale Foundation chief executive Elizabeth Robb, Andrew George MP, Patients Association chief executive Katherine Murphy and National Nursing Research Unit deputy director Jane Ball.
Dame Audrey Emerton supports the 'never more than 8' message.
Andrew George MP signs up to the Never more than 8 campaign.
Sally Brearley, chair of the prime minister's forum on nursing and care quality, pictured with Joan Myers, nurse consultant in community children's nursing at the Whittington Hospital, North London.
Left to right: Nurse whistleblower Helene Donnelly, Andrew George MP and Julie Bailey of patient's organisation Cure the NHS.