WASHINGTON — Kathleen Sebelius, the secretary of health and human services, disclosed on Tuesday that she had made telephone calls to three companies regulated by her department and urged them to help a nonprofit group promote President Obama’s health care law. She identified the companies as Johnson & Johnson, the drug maker; Ascension Health, a large Roman Catholic health care system; and Kaiser Permanente, the health insurance plan. At a Congressional hearing, Ms. Sebelius said she had not explicitly asked the companies for money, but urged them to support the work of the nonprofit group, Enroll America. The group, led...