Professor Adam Tomkins ripped into the SNP’s independent bid, saying there was “no justification” for holding another vote.
Speaking to Sky News’ Adam Boulton on All Out Politics, he mocked the party as he said he thought the last referendum was a “once in a generation opportunity”.
He said: “Not now, not again, not at the moment, not amid the alleged uncertainty of Brexit, there’s absolutely no justification or excuse for holding a second independence referendum at this time.
“Not least because the SNP and indeed the broader Yes movement in 2014 said the last independence was a once in a generation opportunity – now I don’t know how long a generation is but it’s certainly a lot longer than two and a half years.”
Professor Adam Tomkins blasted the SNP for its call for a referendum
There’s absolutely no justification or excuse for holding a second independence referendum at this time
Professor Adam Tomkins
SNP member Richard Lochhead, who also appeared on the programme, hit back saying it was an “historic day” for Scotland as MSPs prepared to debate the issue.
He said: “The situation since the last referendum in 2014 has dramatically changed and the people of Scotland voted Remain in the EU referendum in 2016.
“If [the Scottish] Parliament expresses dramatically for a referendum then the UK Government are duty-bound to listen to the Scottish Parliament, elected by the people of Scotland.
“Otherwise, we’d have a major major constitutional crisis and of course, I don’t think the Conservative Party has ruled out a referendum, there’s an argument perhaps about the timing.”
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Professor Tomkins and the SNP's Richard Lochhead clashing on live TV
Professor Tomkins fired back and said the UK Government was “duty bound to listen to the whole of the United Kingdom” during the heated exchange.
The First Minister today kicked off a two-day debate in the Scottish Parliament on whether MSPs will back her call for a fresh independence vote.
The SNP leader told the Holyrood chamber: "The decision to seek parliament's authority to begin the process towards an independence referendum is not one that I have reached lightly.
"It is, therefore, important to set out why we have arrived at this point and also, in light of the significant change facing our country, to reflect on the importance of giving the people of Scotland a democratic choice over our future.
"As a result of the Brexit result, we know that change is now inevitable. The question is what kind of change is right for Scotland and should that be decided for us or by us."