“Don’t you want a president who’s going to make America healthy again?” Robert F. Kennedy Jr. asked a roaring crowd, during Sunday’s triumphal rally in support of Trump at Madison Square Garden. When Kennedy, the country’s most famous anti-vaccine activist, suspended his campaign to endorse Donald Trump, it not only represented the death of his presidential aspirations, but the dawn of something new: the so-called “Make America Healthy Again” movement, a tidy bit of sloganeering designed to highlight where Trump and Kennedy’s agendas overlap. “How can you claim this is going to make people healthy?” The concept is meant to convince skeptical Kennedy supporters to back Trump.