Scottish Conservatives leader Ruth Davidson is to back home secretary Theresa May in the leadership race, once there are two candidates left in the race, City A.M. understands.
Davidson, who led the Tories to second place in the Scottish parliamentary elections in May, will back her irrespective of whom she ends up against, the Telegraph first reported.
The second and final ballot of Conservative MPs is to take place today, with May widely anticipated to progress through to a head to head against either Michael Gove or Andrea Leadsom.
Leadsom this morning gave a speech which was widely billed as a let down, but counts put her ahead of Gove.
After Stephen Crabb withdrew his bid after the first poll - which also eliminated Liam Fox - Davidson tweeted today he had delivered a strong speech and was glad he was backing May.
After the final two candidates are chosen, the wider Conservative party membership will vote on which candidate should be their leader - and therefore Prime Minister.