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.”

Health and Human Services Secretary Robert F. Kennedy Jr. on Tuesday denied agreeing not to make changes to a key Centers for Disease Control and Prevention vaccine safety panel, which has caused a significant stir in the public health community.