Jenny Willott, Lib Dem backbench spokesman on welfare, says it is a "no-win situation for the DWP".

BBC: Terminally ill people warned over possible benefit cut

In one further move, Lib Dem MP for Cardiff Central Jenny Willott becomes an assistant government whip.

BBC: Davey takes over as energy secretary from Chris Huhne

Ms Willott says Lib Dem peers are working on the "issues to be ironed out" in the bill.

BBC: Terminally ill people warned over possible benefit cut