Downing Street said David Cameron remained committed to reform of the House of Lords.
"Both the Prime Minister and the Deputy Prime Minister are committed to Lords reform," a No 10 spokeswoman said.
She added that all members of the Government would be expected to support the legislation when it comes to Parliament.
"If it is Government policy, one expects the Government to support it," she said.
She said ministers were "not persuaded" by calls for a referendum on the issue.
A senior Liberal Democrat peer has warned Conservatives that they must back coalition plans to reform the House of Lords - despite a threatened revolt by Tory backbenchers.
Senior Lib Dem peer Lord Oakeshott insisted today that the plan was part of the coalition agreement and should be supported by MPs of both parties. He said:
"Our vast unelected House of Lords is overstuffed with complacent dinosaurs.
"Electing both Houses of Parliament is a simple democratic principle, it's in all three major parties' general manifestos and the coalition agreement.
"So all coalition MPs should back it - and Labour mustn't drag their feet on this long overdue reform."
Conservative MPs are reported to have lined up to condemn House of Lords reform proposals - set to form the centrepiece of next month's Queen's Speech - during a "stormy" meeting last night of the party's backbench 1922 Committee.
A number of ministerial aides are reported to have indicated they would rather resign than support legislation for a largely- or wholly-elected upper chamber.
The Chancellor George Osborne has opened up a debate about transparency after suggesting that politicians' tax rebates should be made publicRead the full story ›
Asked whether he'd publish a full list of his dinners and meetings, Labour leader Ed Miliband said, "I'm very happy to be open and transparent about what we're doing."
"I think the stain on the character of the Government needs to be dealt with and I think only a full independent inquiry, done by the independent adviser on ministerial interests, will do," he added.
Labour have raced into a double-digit opinion poll lead over the Conservatives after the fall-out from the Budget and cash-for-access controversy, a ComRes survey for The Independent shows.
- Labour - 43%
- Conservatives - 33%
- Liberal Democrats - 11%
- Others - 13%
The Tories have released a list of party donors who attended a lunch with the PM, with Labour calling for an independent inquiry.Read the full story ›
William Hague has told ITV1's The Agenda that donors do not influence him on his foreign policies. Mr Hague said that "if anyone ever influences me on any policy it's somebody that I meet at surgery or somebody I meet in Afghanistan or Iraq".
Mr Hague denied the existence of a 'policy committee' and said: "Peter Cruddas resigned because he said some silly things. Things that he acknowledges were not true, that there was a policy committee- there isn't such a committee that donors can feed into".
The Foreign Secretary has discussed cash-for-access on ITV's The Agenda with Tom Bradby. Speaking as one of the guests on the programme to be broadcast at 10.35pm tonight, William Hague was asked what £250,000 buys:
"Hopefully only the satisfaction of supporting a political party. I don't think you'll get much more than that. All the parties have had problems with allegations about funding.
"If there's one reassuring thing that I can say as somebody who's served in two cabinets is if people think that an individual donor, a rich person, can change a policy by giving money to a party - I haven't ever seen on the inside an example of that".