Prime minister Theresa May is to announce a review of UK government departments to make sure they work in the best interests of devolution. Mrs. May will make the announcement during a visit to Scotland this week in one of her final visits as prime minister.
It was described as a desperate act by Nicola Sturgeon. The review will be chaired by Lord Dunlop, the former Scotland Office minister.
It will ensure that all of the UK government's structures - including government departments - are co-operating to ensure devolution works. The move is seen as a necessary step, particularly after the UK's departure from the European Union.
Scotland's first minister has said she wants to hold a second referendum on Scottish independence if the country is taken out of the EU. And Scotland Secretary David Mundell has warned that a no-deal Brexit could threaten the continuance of the UK.
Both Jeremy Hunt and Boris Johnson have committed to strengthening the union, but neither has ruled out leaving the EU without a deal.
When news of the review was reported by The Scotsman on Tuesday night, there was concern that it could stray into devolved areas - but Number 10 made clear it was not the case.
Nicola Sturgeon said it was a desperate act by a prime minister who has shown zero respect for the Scottish Parliament during her time in office.
It's for the Scottish people - not a Tory PM - to consider and decide what future we want for our parliament and country.
Mrs. May's visit north of the border will come the day before a Conservative leadership hustings in Scotland.
On Sunday, Mr Johnson outlined plans for a unit in Number 10 which would sense-test and stress-test every policy for the results it would have on the union. And he said the next prime minister should be minister for the union, a position which was cost-free but symbolically significant.
Meanwhile, Mr. Hunt said he would ensure the UK left the EU in a way that protects the union.