Health experts stated that there is no scientific evidence to support the changes to vaccination policy approved by Trump. The order also calls for childhood vaccines, “to the maximum extent feasible,” to be administered at separate medical visits. It cited an HHS assessment that the U.S. currently recommends more childhood vaccines than its peer developed countries, with some European countries recommending less than half as many vaccine doses. HHS Secretary Robert F. Kennedy Jr. has been a major force behind the effort to overhaul the vaccine schedule. The controversy comes amid renewed measles outbreaks and declining childhood vaccination rates in the United States.