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This letter is incendiary.

Incendiary because it is a direct, unflinching assault not just on the prime minister's political capabilities - or lack of them, as she claims - but on his integrity.

Her language drips with derision.

Betrayal. Equivocation. Disregard. Wishful thinking. Uncertain. Weak.

She claims to have presented Rishi Sunak with a document outlining her conditions for serving as his home secretary.

Those close to Suella Braverman claim Mr Sunak read and agreed the document the letter refers to, say he took a copy and there were witnesses.

Tonight, I have asked to see that document and was told it was "not for today".

That suggests she intends to drip feed her pungent critique - in an attempt to maximise the damage it might cause the government.

Downing Street's response to Mrs Braverman's letter hints at a frostiness, to put it gently - "the Prime Minister believes in actions not words", a spokesman noted acidly.

It is to those actions, or lack of them, that attention turns here tomorrow, with the Supreme Court's decision on the government's plan to send some migrants to Rwanda.

Expect to hear more from Mrs Braverman after we've heard from the judges.

The former home secretary isn't going quietly and she isn't finished yet.