Liberal Democrat MP and former Scottish Secretary Alistair Carmichael, who is at the centre of a row over a leaked memo, has told ITV News that he will not resign over the issue.
But Mr Carmichael still faces anger over his admission that he sanctioned the release of the document during the election campaign about the SNP leader Nicola Sturgeon and her alleged preference for Prime Minister.
ITV News correspondent Martin Geissler reports:
An online campaign aiming to raise funds for a legal battle against former Scottish Secretary Alistair Carmichael has raised more than £10,000.
The Liberal Democrat MP has faced calls to resign after he was identified as having been behind a leaked memo that alleged SNP leader Nicola Sturgeon had privately favoured a Conservative victory at the General Election.
Carmichael had initially denied responsibility for the leak.
More than 700 people have now donated to the online campaign - named "The People Versus Carmichael" - which was started by pro-independence and SNP supporter Fiona MacInnes.
It aims to raise £60,000 for "legal representation to hold Alistair Carmichael accountable for his behaviour before, during and after the election campaign".
The campaign promises: "If successful we will raise an election petition in the courts. This could begin a process which could have the recent result in Orkney and Shetland overturned."
Police have confirmed they are looking into a complaint made against Liberal Democrat MP Alistair Carmichael over his involvement in a leaked memo about SNP leader Nicola Sturgeon.
A Police Scotland spokesman said: "We can confirm that a complaint has been received and inquiries are ongoing to establish whether there is any criminality."
If every MP that lied was subsequently sacked, the House of Commons would be emptied "very fast", the former deputy leader of the Liberal Democrats has said.
Sir Malcolm Bruce made the comments in a defence of party colleague Alistair Carmichael, who has faced calls for his resignation over a leaked memo alleging Scottish First Minister Nicola Sturgeon privately wanted David Cameron to win the General Election.
Carmichael, the only remaining Lib Dem MP in Scotland, has apologised to Sturgeon and the French ambassador to the UK after the Cabinet Office found he bore responsibility for the sharing of the document with the Telegraph.
Speaking on BBC Radio 4's Today programme, Sir Malcolm said: "If you're suggesting every MP who has never quite told the truth or indeed told a brazen lie, including ministers, including Cabinet ministers, including prime ministers, we'd clear out the House of Commons very fast, I would suggest."
Questioned further on the apparent claim that lying in public life was widespread, he said: "No. Well, yes - I think the answer is lots of people have told lies and you know that to be perfectly true."
"But Alistair has taken consequences. He has apologised. He's indicated had he been a minister he would resign. He's forfeited his severance pay," he added.
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Tim Farron has declared he has entered the Liberal Democrat leadership race.
The former party president told BBC Radio 4's Today programme:
I have spent the last six days listening to hundreds and hundreds of members who have been urging me to do it.
My message to them is if they are up for the fightback I will step forward and put myself forward to be the next leader of the Liberal Democrats.
Mr Farron joins former health minister Norman Lamb as the contenders to replace Nick Clegg following the party's disastrous general election results.
The "debacle" of the Liberal Democrats' U-turn on university tuition fees "massively undermined" voters' trust in the party, one of its leadership candidates has said.
Norman Lamb said the Liberal Democrats had learned an "extremely painful lesson" from raising tuition fees to £9,000 while in coalition government with the Conservatives, despite ex-leader Nick Clegg's pledge to vote against any increase.
"Trust for me is critically important and that debacle massively undermined people's trust in the party," he told BBC Radio 4.
"I believe very strongly that we have now learned a massive lesson, an extremely painful one. But I don't think we will ever make that mistake again."
Lamb - who confirmed to ITV Anglia yesterday that he wanted to replace Nick Clegg - voted in favour of tuition fee increases in 2010, while his potential rival for the leadership, Tim Farron, rebelled and voted against the policy.
Norman Lamb said he has "never shrunk away from a challenge" as he announced he will run for the leadership of the Liberal Democrats.
The Norfolk North M, who held his seat with a reduced majority of 4,043, said he would put "body and soul" into the job.
Speaking to ITV News Anglia, Mr Lamb said: "I think we've got a lot of learning to do and we've got to understand where we went wrong.
"..I suspect in the next five years, with the Conservatives on their own, people might start to see what a good restraining influence we were and also some of the very progressive policies that we actually achieved in government."
He is the first to declare his bid in a race expected to be dominated by him and former party president Tim Farron, who has expressed anger that the election was fought "on the politics of fear".
Norman Lamb says he considering standing for the position of Liberal Democrat leader.
Lamb told ITV Anglia's Malcolm Robertson he will make an announcement on his decision in the near future.