Liberal Democrats are campaigning to stop a welfare cut that is unfair to single parents. Peers in the House of Lords are to launch a bid to block a welfare reform which could cause hundreds of thousands of families to lose an average of more than £1,000 a year.
Tim Farron branded the changes as "tax credits mark 2" with up to half a million claimants potentially being affected.
Last year, peers forced George Osborne to ditch a shake-up of tax credits which experts warned would have hit millions of families.
The reform aimed to save £4.4 billion from the welfare bill but the House of Lords voted 289 to 272 to delay the changes for three years until measures could be introduced to protect poor families.
Condemning the universal credit changes, which are due to come into effect next year, Mr Farron said: “This is tax credits mark two. We stopped that and we will stop this.
"The Conservatives claim they want to support two-parent families, yet their attack on universal credit will mean that single parents who find a new partner will actually be penalised.”
You can sign the petition at http://change.libdems.org.uk/universal-credit