TORY members howled with laughter as an audience member at the leadership hustings suggested Liz Truss “build a wall” to deal with the prospect of Scottish independence.

The FT’s Sebastian Payne had asked the Tory leadership hopeful how she would handle the push for independence from the Scottish Government. Truss has already said she would not grant a Section 30 order to allow indyref2 to go ahead.

“Independence is very much a question again,” the journalist said. “What is your plan to reverse that?”

Before the Foreign Secretary had a chance to answer, a member in the audience suggested a Trumpian method to control the country.

“Build a wall,” he shouted – prompting cheering and laugher among the Exeter crowd.

The Tory member’s suggestion may also be a reference to Hadrian’s Wall and the Antonine Wall, which were build by the Romans across the width of northern England and the central belt between AD 122 and AD 142, making the boundary between Britannia and unconquered Caledonia.

During the hustings on Monday, the favourite to become the next PM also took aim at Sturgeon more generally.

“She’s an attention-seeker, that’s what she is,” Truss said to rapturous applause from members in the audience.

“What we need to do is show the people of Scotland, Northern Ireland and Wales what we’re delivering for them and making sure that all of our Government policies apply right across the United Kingdom.”

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Brexit Opportunities Minister Jacob Rees-Mogg doubled down on the attack, telling Sky News on Tuesday: “When she’s waffling on endlessly about having a referendum and going to the Supreme Court and all of this, we need to be saying ‘Hold on – you’re doing this because you’re failing to deliver for the people of Scotland, and the United Kingdom Government will have to deliver for the people of Scotland as well’.”

Deputy first minister John Swinney said “people in Scotland, whatever their politics, will be absolutely horrified by the obnoxious remarks that Liz Truss has made”.

He told BBC’s Good Morning Scotland: “Nicola Sturgeon has far more democratic legitimacy than Liz Truss is going to have if she becomes the prime minister, and I think Liz Truss has absolutely no right or foundation to make these remarks.”