The order has since drawn sharp, widening criticism from the medical establishment, with major professional organizations and at least one vaccine manufacturer disputing the scientific basis for the changes. It also calls for splitting the combined measles-mumps-rubella vaccine into three separate doses administered at separate visits, a change the administration frames as reducing the cumulative number of injections given to infants. The American Medical Association's president said Monday that Trump's new recommendations put children's health at risk, joining what has become a broad chorus of medical criticism. The order drew swift criticism from within Trump's own party as well. Republican lawmakers in Congress were largely silent in the immediate aftermath of the order, with Cassidy remaining the most prominent GOP voice publicly breaking with the administration's approach.