Background: What is the row about?published at 18:55 Greenwich Mean Time 21 March 2018
Whitehall analysis has identified 153 areas where policy in devolved areas is currently decided in Brussels.
The UK government's Brexit bill had initially proposed returning all of these to Westminster immediately after Brexit.
But it has recently put forward changes that would see the "vast majority" of those EU powers instead returning directly from Brussels to Edinburgh, Cardiff and Belfast.
This would include in areas such as carbon capture, water quality and energy efficiency.
But it has named 24 devolved policy areas where it wants to retain power temporarily in the wake of Britain's exit from the bloc, including in areas such as agriculture, fisheries, food labelling and public procurement.
The UK government says this is necessary to avoid different parts of the UK having different food hygiene or safety regulations.
But the Scottish and Welsh governments have repeatedly accused the UK government of a "power grab", and have introduced their own Brexit legislation in their respective parliaments.