Trump promotes unproven theory about Tylenol and autism. What does the science say?

Secretary of Health and Human Services Robert F. Kennedy Jr. and President Trump at the White House on Monday. (Kevin Lamarque/Reuters) One day after claiming his administration has "found an answer to autism," President Trump announced new efforts on Monday to warn Americans that taking Tylenol and other acetaminophen-based pain relievers during pregnancy could be linked to the neurological condition — and to encourage the use of leucovorin, a lesser-known cancer and anemia drug, to treat it. B…