There are attacks against the witnesses giving testimony by Trump and his supporters, including attempts to smear Lieutenant Colonel Alexander Vindman, Ukraine expert at the National Security Council who this week provided crucial testimony about Trump’s telephone call to Ukrainian president Volodymyr Zelensky. And there have been the extraordinary scenes of congress Republicans breaking into the proceedings and disrupting them.

At the same time, overshadowed by the publicity around the impeachment, is the ever-broadening investigation by William Barr, the attorney general, which the White House sees as a game-changer. An investigation which is seeking nothing less than to overturn the conclusion of the US intelligence services and special counsel Robert Mueller that Russia interfered in the last US presidential election…

And the information being requested has left allies astonished. One British official with knowledge of Barr’s wish list presented to London commented that “it is like nothing we have come across before, they are basically asking, in quite robust terms, for help in doing a hatchet job on their own intelligence services”.