In testimony to the Senate Finance Committee, Mr. Kennedy seemed to confuse the two government programs that cover more than 150 million 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,

Robert F. Kennedy Jr. struggled Wednesday to answer questions about Medicare and Medicaid or to provide details about how he would work to drive down health care costs.