JPL Director Michael Watkins, left, explains to U.S. Vice President Mike Pence, daughter of Mike Pence, Charlotte Pence, and wife of Mike Pence, Karen Pence the progress for the Mars 2020 mission while inside the Spacecraft Assembly Facility (SAF) during a tour of NASA's Jet Propulsion Laboratory, Saturday, April 28, 2018 in Pasadena, California. Photo Credit: (NASA/Bill Ingalls)