Only Scottish Conservatives can keep the Union together, according to Boris Johnson.
Speaking in Scotland on a tour of the Roseisle Distillery, the prime minister said the Tories would bring "our great country together" should they win at the polls on December 12.
The majority of people in Scotland (62%) voted to Remain in the 2016 EU referendum and Brexit has intensified debate over a second vote on Scottish independence. Labour have suggested they would not stand in the way of an indyref2.
But Mr Johnson dismissed the idea of another Scottish independence, saying: "We're the party who are going to keep our fantastic United Kingdom together."
"It's only Scottish Conservatives who can prevent another referendum next year under Jeremy Corbyn who's some a deal with the Scottish Nationalist Party because that's only way he can see getting into power," he said.
"And not only would he have a referendum on the EU. So we're the party that's saying 'come on, let's get together as a whole UK, let's get Brexit done, get this thing over the line and then get on with bringing our great country together and unleashing the potential of the whole UK'. And it's only Scottish Conservatives who can prevent that second referendum."
Asked about SNP leader Nicola Sturgeon's comment that Mr he would find the case for allowing another independence referendum "irresistible", Mr Johnson insisted that Scots were promised the 2014 vote was a "once-in-a-generation thing".
The prime minister sampled a whisky on his tour of the distillery, describing it as "delicious". Mr Johnson jokingly told reporters he was "not allowed" to sample too much of the spirits on offer at the distillery before taking another small sip.
The visit was the second of a three-nation campaign trip on the first full day of his General Election tour after launching the Conservative election campaign yesterday.
Mr Johnson's day on Thursday morning with a strong brew at the Tetley tea factory in Teesside.
Mr Johnson greeted those travelling with him and repeatedly remarked it was “Con Air” – an apparent nickname for the Conservative campaign plane rather than a direct reference to the 1997 action movie starring Nicolas Cage.
First on his travels was the Tetley Tea factory in Eaglescliffe where he asked staff whether it was best to leave the tea bag in the cup and which tea was best.
On the tea he was drinking, the PM said: “I need it, the plane was freezing.”
He was later given a tour of the production line and weighed boxes of teabags.