Labour plans for a "radical reshaping" of the United Kingdom will be voted on by members at the party's Scottish conference.
Members are being asked to endorse a vision set out by Scottish leader Kezia Dugdale for a new "Act of Union" for the UK in response to both Brexit and calls for a second Scottish independence referendum.
The motion, which will be put before the Scottish Labour conference in Perth, calls on the UK party to convene a "People's Constitutional Convention", made up of citizens from across the UK, which would then report back before the 2020 general election.
That convention is part of Ms Dugdale's vision for a more federal UK, which would also see increased powers for Holyrood, Cardiff Bay, Stormont and the English regions.
The conference comes at a time when Labour across the UK is trailing behind the Conservatives in the opinion polls.
In Scotland, which was once a heartland for the party, they won just one seat north of the border in the 2015 election and the party is now the third largest at Holyrood, having been overtaken by the Tories.
The result of the Brexit referendum, which saw most Scots vote to stay in the European Union while the UK as a whole voted to leave, has led to renewed calls in Scotland for another independence referendum.
Ian Murray, Labour's only Scottish MP, will tell the conference Labour wants to "reforge" both democracy and society to "safeguard it for the future".
He will hail the proposals for a new constitutional settlement for the UK as a "historic moment" for the party, with Labour "now ready to seize the mantle as the party of federalism".
Mr Murray, Scottish Labour's Westminster spokesman and an ally of Ms Dugdale, will say: "Our vision - the Scottish Labour vision - is for a radical reshaping of the UK that offers a post-Brexit solution that delivers for the four corners of these islands.
"It is time for a new Act of Union - it has been 300 years since the last one - one that is fit for purpose in the 21st century.
"The federal solution we propose would renew and refresh our ailing democracy, and give a voice to those who feel they have none.
"It would allow us to mitigate the failures of the past and lay the foundations for a better future.
"It would uphold the democratic will of the Scottish people: a strong Scotland in a secure United Kingdom, with a close relationship with Europe."
He will hail that as a vision of "hope and optimism" which will "mean that every part of the UK and every part of Scotland is contributing to our success".
The MP will continue: "It will reforge our democracy and our society, and safeguard it for the future.
"This is an historic moment for our party. The party of devolution - now ready to seize the mantle as the party of federalism.
"The party that stands up for what the majority of people in Scotland want - firmly, unquestionably opposed to independence, but also opposed to the status quo. The party that believes together we're stronger.
"Today our country is deeply divided, not just by constitutional politics but by economic inequality.
"To restore faith in our politics, to build a more united society and create an economy that works for working people, we believe that we need to create a more federal UK."
Ms Dugdale said later that UK Labour leader Jeremy Corbyn "fully supports" the plans for a more federal UK, even though he said previously he "wouldn't use the words new Act of Union".
The Scottish Labour leader told BBC Radio Scotland: "Jeremy Corbyn fully supports the proposals I have been putting forward for a People's Constitutional Convention.
"He also recognises that when I'm talking about repatriating huge numbers of powers from Brussels to Britain, more powers from London to Edinburgh, that you would need a piece of legislation to do just that.
"I've referred to it as an Act of Union, and I understand that Jeremy Corbyn might prefer to use other words, because he has got to examine the case for powers across the whole of the United Kingdom, not just between Scotland and Westminster, he's got to consider the needs of Wales, the needs of London, the needs of the north of England where we have got metropolitan mayors now.
"We shouldn't obsess about the words, what there is underneath all of this is a principle and a great idea of how we can heal our divided country, bring people people back together, unite our country, focus on the future and the challenges that we face."
The slogan for the Scottish Labour conference is "Together We're Stronger", and Ms Dugdale added: "We can have a strong Scottish Parliament in the United Kingdom and have as close a relationship with Europe as possible, that's what Scots want."
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