President Donald Trump and his Health Secretary Robert F. Kennedy Jr. say they want the government to follow “gold standard” science. Scientists say the problem is that those two are often doing just the opposite by relying on preliminary studies, fringe science or just hunches to make claims, cast doubt on proven treatments or even set policy. Experts say gold standard science is objective, transparent and evolves with new knowledge. Scientists say the process of getting medicines and vaccines to market and recommended in the United States has, until now, typically relied on gold standard science.