LIBERAL Democrat leader Vince Cable has urged the SNP to put the "wider national interest" before "narrow party advantage" and back proposals for another Brexit referendum.
His party wants a public vote once the terms of the UK's departure from the EU are known.
First Minister Nicola Sturgeon has previously said a second ballot could become an "irresistible" prospect for the public, but has stopped short of fully endorsing one.
Addressing the Scottish Lib Dem conference in Aviemore, Cable said support for the campaign to stop Brexit was building.
He said the UK Government's deal with the EU was "unravelling", citing problems resolving the Irish border issue, and claimed the recent Windrush scandal had exposed the "potential nightmare" of managing EU migration.
"The proposals for the Irish border have been comprehensively rejected out of hand, the chaos around immigration shows that the registration of three million people is potentially a nightmare, and the Commonwealth has shown very little interest in the free trade proposals," he said.
"I think what's happening on the back of all this is a recognition that we have to have a public vote on the final deal."
Cable told supporters that the House of Lords was "almost certainly going to come forward with a referendum on the final deal".
"Each of the political parties will have to stand up and be counted," he said.
Cable also used his speech to attack the UK Government's decision to carry out air strikes in Syria without consulting Parliament.
He said: "We do accept that there are circumstances where governments do have to intervene.
"On this particular occasion, the emphasis of our campaigning was on making sure there was a proper debate in Parliament.
"This wasn't just a pedantic, procedural argument, it was actually about demanding that if we intervene in a military way the government of the day has to get the country behind it."
Elsewhere at the conference, delegates also voted in favour of lowering the minimum age for candidates standing in Scottish parliamentary elections from 18 to 16.
The move would bring the candidacy age in line with the Holyrood voting franchise.
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