Nicola Sturgeon’s strategy of making the next Westminster general election a de facto referendum will not secure Scotland’s independence, a senior SNP MP has warned.
Stewart McDonald said the party should instead be focusing on driving up support for Scotland leaving the UK and that "we need to get that campaign fired up now".
The Glasgow South MP was previously the party’s defence spokesman in the House of Commons.
He was speaking as he published a paper which describes a de facto referendum as a “deficient mechanism for the party to opt for” which has “the potential for all sorts of problems for the cause”.
It comes as former Scottish Government minister Alex Neil declared a de facto referendum was “likely to be an own goal” for independence campaigners.
Their intervention comes ahead of a special SNP conference next month which the party will use to set out its pathway to securing independence.
The conference was planned after the Supreme Court ruled the Scottish Parliament does not have the power to hold its own referendum without Westminster support.
Successive Conservative prime ministers have refused requests from Sturgeon to stage another ballot on the future of the UK.
McDonald said in his paper: “A de facto referendum, regardless of whether it takes place in a Westminster or Holyrood election, will not secure Scotland’s independence.”
With a “new, more muscular form of British nationalism” within both the Conservatives and Labour, he said even if the SNP won the vote the UK Government could refuse to open independence negotiations.
He said: “If only one government is treating an election as a de facto referendum, how can a result for independence be implemented?”
McDonald told BBC Radio Scotland’s Good Morning Scotland programme that the move for a de facto referendum within the SNP is a “a symbol of our own impatience”.
He added: “The problem I think we need to solve is that at the minute we don’t have majority sustained opinion in favour of independence.”
He said Scotland needs to secure the “power that the Supreme Court made clear that the Scottish Parliament doesn’t have”.
McDonald argued this could be achieved by seeking to drive support for independence higher.
He said: “I think part of the reason why we are stuck at the moment… is because support for independence isn’t yet clearly the sustained majority opinion in Scotland.
“I think that is the problem we need to fix with urgency before we go into the next election.
“The UK Government line has been ‘now is not the time’. That suggests that there is a time, and I think we get to that point by driving support for independence higher than it is now.”
McDonald said his party should “stick to calls for a legitimate referendum”.
He added: “I think our main job is not to continue in the fashion that we have been, but instead we need to get that campaign fired up now, so we go into the next election with the public at our backs, clearly supporting Scotland’s independence and its future place back into the European Union through a legitimate, lawful referendum.”
He claimed that the SNP should "relish" this. He said: “If there’s one thing this party knows how to do it is how to campaign, and I think that is how we can change the mood across the country in favour of independence.”
Neil meanwhile said: “Stewart is correct when he points out that a ‘de facto referendum’ is likely to be an own goal.”
The former MSP argued in the A Scotland That Can Vote Yes Paper: “The chances of obtaining 50% of the vote in a UK general election are slim indeed.
“Even if we were to repeat the 2015 result when we won 56 of the 59 Scottish seats at Westminster, we would still only get 49.7% of the vote.
“The ‘de facto referendum’ will have been lost. Why hang that noose round our independence necks?”
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