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David Cameron has admitted he "contemplated having to go" if Scotland voted for independence.
The Prime Minister said he would have been "heartbroken" by the break-up of the UK and considered his position when polls put the Yes campaign ahead just days before the referendum.
Speaking to the Sun on Sunday, Cameron said: "Of course, I contemplated having to go. I thought, 'What's the right thing to do?' In many ways the easiest thing would be to say, 'I feel wounded by this' and walk away.
"In the end I came to the conclusion that would not have been the right thing to do."
Scottish voters later rejected independence by 55% to 45% and it was First Minister Alex Salmond who resigned, announcing hours after the result was declared that he would be stepping down in November.
Alex Salmond will return to Holyrood today for the first time since his bid for Scottish independence failed.
Mr Salmond, who has announced his intention to step down as First Minister, is expected to reflect on the independence referendum and put pressure on the victorious unionist parties to deliver on their devolution pledges in a statement to the Scottish Parliament.
Presiding Officer Tricia Marwick will open today's proceedings with "time for reflection", a Holyrood slot normally reserved for spiritual or philosophical contributions from religious or secular figureheads.
Mr Salmond's statement will be followed by two days of debate on the future of Scotland, with Labour leader Johann Lamont, Conservative leader Ruth Davidson and Liberal Democrat leader Willie Rennie expected to open with responses from the Scottish opposition parties.
Scotland voted against independence by a majority of 55% in the referendum on Thursday.
The Justice Secretary has said that Scottish MPs should not be allowed to vote on English laws.
Writing in the Telegraph, Chris Grayling said that there cannot be a situation where Scottish MPs "come to Westminster and vote on English-only issues", influencing the destiny of health, education, justice, environment and probably taxation in England, "potentially against the wishes of most English representatives".
It is only a matter of time before Scotland becomes an independent nation, Alex Salmond has suggested.
The First Minister, who this week announced his intention to resign from his post, said the majority of younger Scots supported independence.
He told Sky News' Murnaghan programme: "When you have a situation where the majority of a country up to the age of 55 is already voting for independence, I think the writing's on the wall for Westminster."
"I think the destination is pretty certain, we're only now debating the timescale and the method," the SNP leader added.
The head of the Better Together campaign, Alistair Darling, has paid tribute to his former opponent, Alex Salmond, following his recent decision to step down as First Minister.
Mr Darling told the BBC's Andrew Marr Show: "He is a very formidable politician. He's brought his party from being a fringe sort of protest movement and he's got them into government."
"He's a divisive politician, this is the nature of the beast, if you like. Alex Salmond, he's got his place in history, I'm sure that's what he wanted and that's what he'll get," the former Chancellor added.
A former candidate for the leadership of the SNP has ruled out standing for the position again in the wake of Alex Salmond's sudden resignation.
After Scots voted against independence, Mr Salmond announced he will be stepping down from the position of both SNP leader and First Minister.
Roseanna Cunningham stood for the leadership of the party against Mr Salmond in 2004.
A spokesman for Ms Cunningham, the community safety minister in the Scottish Government, said: "Roseanna wants to make it quite clear that she has absolutely no intention or desire to stand for either the leadership or the deputy leadership of the party.
Deputy First Minister Nicola Sturgeon has already emerged as the clear favourite to take over from Mr Salmond, when he formally steps down at the SNP annual conference in November.
Police have arrested six people after trouble between independence and pro-unionist campaigners in Glasgow's George Square.
Officers, some on horses, separated the groups as hundreds flocked to the square following Scotland's No result in the referendum.
No campaigners, draped in union flags, let off a flare before singing Rule Britannia.
Reports on social media of a stabbing and that a fire next to the Glasgow Herald offices had been started by protesters proved inaccurate.
Police said the numbers gathered quickly fell by around 1am.
Three people have been arrested by police following clashes between pro-union and independence campaigners in Glasgow.
Officers were called to George Square after hundreds of rival supporters gathered in the hours after Scotland voted decisively against leaving the UK.
A spokesperson for Police Scotland said enquiries were underway which could lead to further arrests.
"Three people have been arrested so far in relation to the incident in George Square. Retrospective inquiries will be carried out which may lead to further arrests."
Latest ITV News reports
The woman expected to replace Salmond said she will "follow the mood of the people" if promises made in the run up to the vote are not met.
The double Grand Slam winner said he did not regret giving his opinion, but was 'disappointed' at the way he went about it.