President Donald Trump signed an executive order on Aug. 10, 2026, calling for the combined measles, mumps and rubella vaccine to be given as three separate shots at three separate appointments. The combined MMR vaccine is currently given at 12 to 15 months of age and again between ages 4 and 6.
In the order, Trump also urges states to revisit their school vaccination laws and instructs the Justice Department to challenge state rules on religious and medical exemptions.
