Campaigners have launched a legal bid to overturn the election of Orkney and Shetland MP Alistair Carmichael.
The former Scottish Secretary has come under fire over the leak of a memo wrongly suggesting Nicola Sturgeon wanted David Cameron to be Prime Minister.
A legal challenge will be launched at the Court of Session in Edinburgh after more than £40,000 was raised online to fund legal representation.
Mr Carmichael, who has won the support of his local party, has refused to step down following the revelation that he approved the leak of the memo.
His majority was slashed to just 800 in this month’s general election and he has faced calls to resign over the leak.
Fiona McInnes, one of the organisers who helped raise the legal fund, told BBC Scotland: “There is a large groundswell of opinion now forming that Alistair Carmichael should step down and allow the people of Orkney and Shetland to make the choice about whether they wish to place their trust in him again or not.”
“It is really constituents from Orkney and Shetland asking the courts, or the law of the land, to examine the electoral process in Orkney and Shetland over the election period and to see whether it was run properly and fairly.”
Cabinet Secretary Sir Jeremy Heywood ordered an inquiry after the memo, which claimed Ms Sturgeon told French ambassador Sylvie Bermann that she would prefer to see Conservatives remain in power, became public.
Mr Carmichael apologised after the Cabinet Office investigation into the leak concluded he “could and should have stopped the sharing of the memo”.