President Donald Trump signed an executive order on Monday to drastically change the childhood vaccine schedule by recommending shots be administered in separate visits to the doctor’s office. The executive order acts on Trump’s long-held belief that splitting up routine childhood vaccinations across multiple visits lessens the risk of acquiring autism. That prior attempt to overhaul the childhood vaccine schedule was also blocked in court. Harold Wimmer, president and CEO of the American Lung Association, said the policy could exacerbate already growing childhood vaccination gaps and lead to increased pediatric deaths. “The executive order will cause more confusion for parents and healthcare providers, reduce vaccination rates and increase the spread of vaccine-preventable illnesses,” Wimmer said in a statement.