Labour Deputy Party Leader Harriet Harman accused Nick Clegg of "crying crocodile tears", after the Deputy Prime Minister issued an apology over pledging to scrap tuition fees.
Ms Harman said in a short statement: "This was not just the small print of his manifesto, this was Nick Clegg's key election promise when he asked people to vote for his party. It is not good enough for him to just brush that promise aside.
"Instead of crying crocodile tears he should vote with Labour to bring these tuition fees down. If Nick Clegg does not back his words with action he is just weak and spineless."
A musical version of the Deputy Prime Minister's apology over his pledge to scrap university tuition fees has gone viral.
The youth and student wing of the Liberal Democrat party, Liberal Youth has issued a statement welcoming the Deputy Prime Minister's apology over tuition fees.
Tom Wood, chair of the group said on their website that he had "never been more proud of Nick Clegg".
Liberal youth welcomes Nick Clegg apology for tuition fee pledge
Asked whether the Liberal Democrats would think more carefully about what it pledges in the next general election, Vince Cable said they would "not be going into next election with a lot of expensive pledges".
He also acknowledged the "damage" that breaking the pledge had done to trust in politics.
Vince Cable disagreed with Jeremy Paxman's assertion that the pledge not to raise tuition fees was an election stunt.
It was not a stunt ... it was part of genuinely felt wish to assist the student population. We weren't able to follow through with it, but it was deeper than a stunt.
The Business Secretary Vince Cable has said that he too apologises for the pledge made by his party, the Liberal Democrats, that it would not raise tuition fees. He told the BBC's Newsnight programme that it was a "collective" decision.
He also said there was a distinction between the pledge, and the policy that the party has now adopted, which he said is correct.
The Liberal Democrats should either back or sack their leader Nick Clegg at next week's party conference in Brighton, one of his former advisers has said.
Mr Reeves, who served as director of strategy, said the Deputy Prime Minister could not avoid the question about his future as the party's leader. But the 43-year-old warned the Lib Dems that if they decide to back the Deputy Prime Minister, they must stick with him.
Writing in the New Statesman, Mr Reeves, who has since left the UK to live in the United States with his family, said: "The mutterings have been growing louder for months, certainly since another bruising round of local election results in the spring.
"The question of Clegg's leadership has to be addressed. Indeed, given the party's current position, it would be irresponsible not to do so.
"It is some comfort that David Cameron is facing similar squalls in his own party: at least now the necessary pain of coalition is being shared.
"Cards on the table: I think the party must stick with Clegg, and that Clegg must stick with both liberalism and coalition. Once the party caravan packs up on 26 September and heads inland after conference, the muttering has to stop. If the party is not to sack Nick Clegg then it must back him."
Liam Burns, president of the National Union of Students, said apologising for making the pledge to abolish tuition fees, instead of breaking the promise was an "absolute disgrace" and made his words "empty and hollow."
Liberal Democrat Leader Nick Clegg has apologised for promising to abolish tuition fees during the 2010 election campaign.Read the full story ›
Liberal Democrat Leader Nick Clegg has apologised for promising to get rid of tuition fees for university students. He made the pledge at Cambridge University, during the 2010 election campaign.