The Prime Minister has called the blacklisting of workers by large construction firms "completely unacceptable" ahead of a Labour Opposition Day debate on the issue.
Responding to a question by Labour MP Ian Lavery during Prime Minister's Questions, Mr Cameron said:
The blacklisting that occurred was a completely unacceptable practice. I think the previous government was right to bring in legislation to make it unlawful.
We've seen no evidence the blacklisting regulations introduced are not doing their job and the company responsible was shut down in 2009 ...
I do welcome the openness and frankness that Labour are using an Opposition Day debate to look at something that went wrong while they were in office.
More top news
A 14-year-old boy has said he has been added to a police database after sending a naked image of himself to a female classmate by Snapchat.
Britons are using social media to spread their message that those fleeing persecution are welcome in the UK.
Mel Gibson will not face any police action over an alleged scuffle with a Sydney photographer, the actor’s representative says.