The SNP's Westminster leader has urged his counterparts in the opposition parties to join him in a cross-party summit to stop a no-deal Brexit.

In his letter to the Westminster party leaders Ian Blackford said: "Time is short and we must act to prevent the Prime Minister destroying the futures of citizens up and down the country."

He wrote to Labour's Jeremy Corbyn, Plaid Cymru's Liz Saville Roberts, the Liberal Democrats' Jo Swinson, Caroline Lucas from the Greens, and Anna Soubry from the Independent Group for Change, calling on them to "coalesce against a no-deal Brexit" and the "unmitigated damage" it will cause.

He warned the risk of leaving the EU without a deal has increased after new Prime Minister Boris Johnson refused to rule it out.

Blackford's call for an urgent summer recess meeting follows Chancellor Sajid Javid's announcement of an additional £2.1 billion for no-deal planning.

The SNP MP said: "The past three years of Tory Brexit chaos has pushed Scotland and the UK to the brink, and with Boris Johnson ramping up the rhetoric of a no-deal exit there is a very real risk of being pushed over the cliff edge.

"We know that any Brexit - particularly a no-deal Brexit - will cause unmitigated damage to our economy and people's living standards.

"Time and time again economic analysis has shown that Brexit will be devastating for businesses and public services. The evidence has shown the economic madness of Brexit.

"Rather than acting to prevent such an outcome, the Tory Prime Minister has instead chosen to push ahead by wasting billions of pounds of taxpayers' cash on an entirely avoidable policy - at the same time as public services are still bearing the pain of Tory austerity."

Blackford highlighted Scottish Government analysis suggesting leaving without a deal will cost Scots the equivalent of £2,300 each in reduced GDP and independent economic research forecasting 100,000 Scottish jobs being lost in this scenario.

He added: "This cannot go on. I have written to the Westminster party leaders of Labour, Lib Dems, Plaid Cymru, Greens, and the Independent Group for Change, calling for a cross-party summit over summer recess to prevent the Prime Minister destroying the livelihoods of citizens across the UK, and move forward with efforts to take no-deal off the table."

Meanwhile, the new Scottish Secretary has said the UK Government wants more of a say on how money to replace EU funding after Brexit is spent in Scotland.

Alister Jack said the Shared Prosperity Fund, being set up in the place of EU structural funds, will brand projects it pays for with the union flag.

Details of the new fund have not been finalised but Jack told the Scottish Daily Express that UK ministers would want to agree how the money would be spent with the Scottish Government.

He denied the funding arrangements would be a power grab and said it would instead be a "collaboration".

However, the SNP has accused him of "actively side-lining the country he is supposed to stand up for by aiding and abetting renewed attempts at a blatant Tory power grab - undermining the very foundations of devolution".

Currently, the UK Government has been allocated £17.2 billion of EU structural investment between 2014 and 2020, which ministers have guaranteed to deliver post-Brexit.

Under EU membership, the UK and EU sign a partnership agreement on the direction of the programmes, which are aimed at cutting disparity between EU regions, but the Scottish Government has responsibility for how the money is spent in Scotland.

Jack told the newspaper: "We will be wanting to agree spending proposals and have more direct investment into Scotland."

Rather than leaving the Scottish Government to "get on with it", it is believed future funding could be based on shared, specific goals.

"It's branding the spending of that money - rather than with the EU flag and a saltire, we will have the union flag and a saltire," he added.

"It's just important that the people see the benefits from being part of the great enduring partnership that is the United Kingdom."

The SNP's Scotland Office spokesman, Tommy Sheppard, said: "Alister Jack has been Secretary of State for Scotland for only 11 days and already he is actively side-lining the country he is supposed to stand up for by aiding and abetting renewed attempts at a blatant Tory power grab - undermining the very foundations of devolution.

"Calls to bypass the Scottish Parliament and Government and instead allow the Tory Government to decide what's best for the people of Scotland rips up the established principles underpinning devolution."