WASHINGTON — A pair of unwelcome and destructive guests named Helene and Milton have stormed their way into this year’s presidential election. The back-to-back hurricanes have jumbled the schedules of Democrat Kamala Harris and Republican Donald Trump, both of whom devoted part of their recent days to tackling questions about the storm recovery effort. [time-brightcove not-tgx=”true”] The two hurricanes are forcing basic questions about who as president would best respond to deadly natural disasters, a once-overlooked issue that has become an increasingly routine part of the job.