WASHINGTON — A key Senate health leader is calling for this week’s meeting of the panel of vaccine advisers handpicked by Health and Human Services Secretary Robert F. Kennedy Jr. to be delayed, citing their lack of experience and potential bias against some vaccines.

The Senate health committee chairman said new members of a key advisory panel who were appointed by Robert F. Kennedy Jr. “lack experience.”

Sen. Bill Cassidy called for a meeting of a Centers for Disease Control and Prevention vaccine advisory committee set for this week to be postponed, citing a lack of experience among its new appointees.