The People Rewriting Your Child's Vaccine Schedule Admit They Have No Evidence
On Monday afternoon, President Donald Trump stood in the Oval Office and told the country that the measles, mumps, and rubella vaccine — a shot given safely to hundreds of millions of children over five decades — "could" be "quite lethal."
Minutes later, a reporter asked him the only question that matters: "Is there any evidence of that?"
"No," the president said.
That single word is the entire story of how vaccine policy is now being made in the United States. Not evidence. Not clinical trials. Not the decades of safety monitoring involving millions of children. Just what the president has "heard."
"Let's say there's a 5% chance of it"
The admission came during the signing ceremony for an executive order the White House calls the "Gold Standard Childhood Vaccine Recommendations." The order calls for spreading childhood immunizations across separate medical appointments and, eventually, splitting the combined MMR vaccine into three individual shots, according to the Associated Press.
Pressed on his "lethal" claim, Trump explained his reasoning in full: "What I've heard is that there, there are some people that say it is that way, and I say, 'Well, let's say there's a 5% chance of it.' Let's split it up."
Read that again. The president of the United States is reordering the childhood immunization schedule for an entire nation because "some people say" something, to which he responds by inventing a probability — "let's say there's a 5% chance" — out of thin air.
That is not how public health policy is supposed to work. It is not how any policy is supposed to work. It is a man with no medical training overruling the accumulated judgment of the medical establishment on a hunch he cannot support when asked directly.
The experts were not consulted. They were replaced.
The order did not emerge from a vacuum. Health Secretary Robert F. Kennedy Jr. — an environmental lawyer and longtime anti-vaccine activist with no medical or scientific credentials — has spent Trump's second term systematically removing qualified people from the machinery of vaccine policy, per the AP. He fired the entire 17-member federal vaccine advisory committee and installed replacements whose far more restrictive recommendations have since been halted by a federal judge. He personally directed the CDC to abandon its position that vaccines do not cause autism — without supplying any new evidence.
It was Kennedy's handpicked advisers who first called for splitting up the MMR shot last fall, Axios reported. The White House reportedly urged Kennedy to back off such contentious policymaking earlier this year. Instead, Trump personally revived it, questioning Kennedy about the "lack of momentum" on childhood vaccine changes.
At Monday's signing, Trump repeatedly suggested vaccines could play a role in rising autism rates — a claim that scientific consensus and decades of studies have firmly rejected.
Meanwhile, the newly confirmed CDC director, Dr. Erica Schwartz — an actual physician whose Coast Guard career included promoting vaccination of service members — now faces what Georgetown public health law expert Lawrence Gostin called her "first test." Changes to federal vaccine recommendations customarily require the CDC director's approval, but Gostin warns the Supreme Court's expansive view of presidential power may let Trump simply supersede her. "The President is placing her in an untenable position," he said.
That is the pattern in miniature: the qualified official exists, and the structure is being rearranged so she can be ignored.
What the evidence actually says
Since the president declined to supply the evidence, here it is. The single MMR shot is proven safe and effective, and medical experts warn that breaking it up would leave children vulnerable to dangerous diseases for longer, as The Washington Post reported. Separate measles, mumps, and rubella vaccines are not even currently available in the United States — companies would have to run new clinical trials to create them. Spacing out shots multiplies doctor visits, which multiplies missed appointments and skipped immunizations.
"Today's Executive Order does not change the underlying scientific evidence supporting childhood immunization," said Michael Osterholm, the University of Minnesota infectious disease expert. "That data has been built over decades — through large clinical trials, real-world effectiveness studies and continuous safety monitoring involving millions of children."
And the timing could hardly be worse. The order lands as children return to classrooms amid a measles outbreak that experts say could cost the United States its measles elimination status. Kindergarten vaccination rates are falling, and vaccine exemptions hit an all-time high in the 2024-25 school year.
The confession is the point
There is something almost clarifying about Monday's exchange. Usually, unqualified policymaking hides behind cherry-picked studies and manufactured doubt. This time, the president skipped the pretense. Asked for evidence, he said "No" — and signed the order anyway.
The people making the biggest health decisions in America right now — for your children, at their school, in their pediatrician's office — are a president who admits he has no evidence and a health secretary with no medical training who fired everyone who did. The federal judges who keep blocking these moves, the medical groups suing over them, and the CDC director now boxed into an "untenable position" are the last line of qualified people left in the process.
Parents should listen to the ones who still practice medicine. As Osterholm put it, rely on the recommendations developed by medical and public health experts like the American Academy of Pediatrics — the people who, when asked for evidence, have decades of it.
