However, there is circumstantial evidence that Butler may have colluded with Eden's doctor, Sir Horace Evans, to exaggerate the state of Eden's health to encourage him to resign. Evans wrote Butler an ambiguous letter about "your help and guidance over my difficult problems with AE" and added, "Here we have made, I have no doubt, the right decision". Anthony Howard observes that any interpretation of the letter is "purely speculative" and that there is "no concrete evidence" of what actually occurred.