US President Donald Trump signed an executive order Monday pushing for a rethink of school vaccine mandates and repeating calls for the measles, mumps and rubella (MMR) vaccine to be separated into three individual shots. "States and territories are advised to review" the Trump administration's recommendations on "immunisation requirements for contexts such as school enrolment and attendance", the order states. Try again Cover image: REPORTERS © FRANCE 24 12:59Years of scientific evidence support the safety of a combined MMR vaccine. The Trump administration's push to overhaul vaccine policy comes as its efforts to implement major changes were blocked by a federal court earlier this year, pending further court proceedings. The judge's stay preventing the overhaul sided with major medical organisations, which asserted that the Trump administration's actions to push the changes through were unlawful.