Final answer:
When a patient demands to be discharged without a physician's order, the nurse should ask the patient to sign an AMA (Against Medical Advice) form.
Step-by-step explanation:
When a patient demands to be discharged without a physician's order and is leaving the unit with his belongings, the nurse should ask the patient to sign an AMA (Against Medical Advice) form. This form acknowledges that the patient is choosing to leave the hospital against medical advice and that they understand the potential risks and consequences of doing so. By signing the AMA form, the patient assumes responsibility for their decision and releases the hospital from liability.