Anas Sarwar will use a speech today to announce there should be a "legal duty of cooperation" between the UK and Scottish Governments in an attempt to ease the divisions between Holyrood and Westminster.
The Scottish Labour leader will speak at an event in London where he will criticise both the SNP and Conservatives for trying to benefit from "a political climate which seeks to maximise disagreements and disordered relationships".
The Glasgow MSP will also insist that Nicola Sturgeon's renewed push to hold a second referendum on independence next year is "a
distraction from the SNP’s failures in government".
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Writing in his regular Monday column for the Daily Record, Sarwar said: "The truth that the Tories and the SNP don’t want to talk about is that constitutional politics can never end poverty or inequality.
"It doesn’t put food on the table, build any schools, or train any nurses.
"It cannot - alone - build a better nation.
"But, when both of Scotland’s governments stand to gain politically from the chaos of division, it means bad government thrives and people pay the price.
"That - at the heart of it - is what my speech today is about.
"It will call for a new legal duty of cooperation between UK and Scottish governments - and structures to ensure they work together where they can and not against each other.
"And we are proposing new joint governance councils - new models of inter-government working, designed to heal the bad relationship that exists today.
"All while fostering the creation of a modern, progressive and forward looking United Kingdom.
"The political game-playing of recent years has wounded the devolution settlement.
"We can put cooperation and not conflict at the heart of the United Kingdom to make sure every layer of government works for the people.
"Labour can deliver change without needless division and put power, wealth and opportunity in the public’s hands."
Relations between Holyrood and Westminster have become increasingly strained in recent years as a result of fundamental disagreements over the future of the UK and Brexit.
The decision to leave the European Union led to regular SNP accusations that the Conservatives were instigating a "power grab" that shifted decision-making to Westminster.
The UK Government has also so far refused to grant a section 30 order to Holyrood which would allow the Scottish Government to legally hold an IndyRef2.
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