Letter: National parks are not campaign backdrops

As a retired career National Park Service employee who served our nation as superintendent of six different park units (including Bryce Canyon National Park), I am appalled and disheartened to watch Donald Trump hold campaign rallies on protected public lands.National parks are set aside into perpetuity for all U.S. citizens; therefore, no president should use the backdrop of any unit of the National Park System for partisan purposes as he did at Mount Rushmore National Memorial on July 3. In so