A new White House push could put childhood vaccines back at the center of America’s political debate. Officials are drafting an executive order focused on the childhood immunization schedule, autism research and parental choice, although its final details and timing remain unclear. The move comes even after a federal judge blocked parts of Health Secretary Robert F. Kennedy Jr.’s vaccine overhaul, while decades of research have found no causal link between vaccines and autism. With midterm elections approaching, the issue could prove as politically explosive as it is scientifically contentious.