Driven by a desire to help ex-servicemembers with mental illness, GOP lawmakers led a failed campaign last year to persuade the Biden administration to approve psychedelic drugs. Now they may have found the ally they need in President Donald Trump’s health secretary, Robert F. Kennedy Jr. A longtime believer in psychedelics’ potential to help people with illnesses like post-traumatic stress disorder and depression, despite the lack of supportive evidence Biden officials found, Kennedy is ramping up government-run clinical studies and telling the disappointed lawmakers doctors will be prescribing the drugs soon. “These are people who badly need some kind of...