Senate Democrats are launching an investigation into Health Secretary Robert F. Kennedy Jr.’s changes to vaccine policy, including the remaking of a federal vaccine advisory panel. In a letter to Kennedy, Sens. Ron Wyden (D-Ore.) and Maggie Hassan (D-N.H.) demanded that he produce communications and other records to show who in the Trump administration determined the legal and public health consequences of the actions related to revamping the Advisory Committee on Immunization Practices…
