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Cabinet ministers Dominic Raab and Liz Truss have staked rival claims to the 115-room Chevening House.
Following Boris Johnson's dramatic reshuffle, former foreign secretary Raab and replacement Truss both think they should have use of the grace-and-favour residence.
The palatial 17th century estate, set in 3,500 acres of land, is traditionally reserved for the foreign secretary but while no longer in that role Raab is now deputy Prime Minister, a position last held by Nick Clegg who shared Chevening with then-foreign secretary William Hague.
Boris Johnson will have to adjudicate, although Truss is said to be "relaxed" and focusing on other things, The Times reports.
It was Johnson who previously was forced to share the residence, near Sevenoaks – working around Brexit secretary David Davis and international trade secretary Liam Fox while at the Foreign Office.
Johnson also spent a weekend at Chevening more recently, heading south while Chequers was being refurbished.
Chevening, which is used by the foreign secretary to entertain visiting dignitaries, has a lake, tennis courts, maze, woodlands and immaculately maintained gardens.
It was made available to government by Lord Stanhope in 1967.
The foreign secretary also gets use of a luxurious townhouse in Carlton Gardens, central London, that has its own ballroom.