Trump’s biggest preoccupation seems to be with the U.S.’s approach to vaccination against measles, mumps and rubella. The long-used MMR shot, which combines three vaccines, should be replaced with separate shots given at separate times, Trump said in a news conference. That’s what makes this cavalier attempt to overhaul to the vaccine schedule so dangerous: children would easily fall through the cracks. When describing the MMR vaccine currently in use, he wrongly claimed the combined shot could be “quite lethal,” but that separate vaccines “are not at all lethal, but just very effective. And he and Kennedy might not have directly reiterated the thoroughly debunked claim that vaccines cause autism, but the implication was clear.