Trump needs to start asking “Where is Hillary? Is the campaign too strenuous for her?”
If Trump brings this up at each and every event, it may cause people to begin to notice the disparate number of events the two candidates organize and attend. Trump is EVERYWHERE and his large audiences include lefty disruptions, which he handles well. The Hildebeast attends only small events with well-vetted audiences that are fully supportive, ensuring she does not have to defend her lines of BS.