"He could grab the bully pulpit and let the people know that it is wrong, just flat wrong, to terminate the life of a defenseless and disabled woman on anything less than her own written medical directive"
That is an outstanding idea.
I would bet cash money that the hospice has overbilled on medications, treatments, etc. and is guilty of Medicare or Medicaid fraud. If my suspicion is correct and the government has found billing records which would support an investigation, then I believe the executive branch has the authority to subpoena the owners of the hospice, employees, and patients. This would involve the DOJ, not the Congress. It also would require a federal grand jury. In the process, one would gain access to medical records and could reinsert the tube pending the review of the medical records.
I realize this is a pretty far stretch, but I am trying to think of something legal and effective. Those who disagree with me, please point out where I am wrong.