Former health secretary Andy Burnham has denied putting pressure on the CQC, insisting he actively worked to identify problems at hospitals during his time in office.
Responding to questions from Morecambe and Lunesdale's Tory MP David Morris he said he introduced a new system of registration of hospitals and urged the CQC to complete the work before the end of the parliament.
"The very purpose of this process was publicly to identify organisations with weaknesses," he said.
"At the end of it, 22 separate organisations were registered with conditions. So, far from covering up any problems at hospitals in the pre-election period, I hope you can now see how I was actively working to identify them."
Parents of a baby girl, who died at one-day-old, have said they are "sickened" they were not told of earlier failings at Furness Hospital.
The health watchdog has named the individuals accused of allegedly covering up its failure to investigate at a Cumbria maternity unit.
Cynthia Bower has been named as one of the individuals allegedly involved in the hospital deaths inquiry 'cover-up'.