Education minister David Laws has said today that it would have "technically possible" to keep the tuition fees pledge but only if the Liberal Democrats had been governing on their own, after the Deputy Prime Minister issued an apology over the pledge.
Mr Laws told BBC Radio 4's Today programme that if the party had "ditched other key commitments" such as tax breaks for the low paid and support for disadvantaged pupils, then it would have been "possible".
He added that all Lib Dems bore a "collective responsibility" but denied it was a failure of leadership on Nick Clegg's part, pointing out that the party had to keep its pledges on a range of other "big and important issues".
Nick Clegg has allowed a satirical site to release a musical version of his apology over his pledge to oppose an increase in tuition fees
Liberal Democrat Leader Nick Clegg has apologised for promising to abolish tuition fees during the 2010 election campaign.