In a contentious confirmation hearing to become the nation's top health official, Robert F. Kennedy Jr. struggled to answer questions about Medicare and Medicaid, programs that affect tens of millions of Americans,

Robert F. Kennedy Jr. struggled to answer questions from Sen. Bill Cassidy (R., La.,) about Medicare and Medicaid. When asked about how care for people who are eligible for both federal health programs could be integrated,

While Mr. Kennedy, seeking the job of health secretary, has been vocal about vaccines and his desire to overhaul the nation’s diet, he has said very little about other issues.