Nancy Guthrie Update: 2 Theories Floated for Kidnapping Motive

Four weeks ago today, the search for Nancy Guthrie began. Since then, local and federal investigators have worked tirelessly to try to bring the 84-year-old Tucson, Arizona resident home.

Despite all the leads that have been pursued, authorities still haven't landed on a concrete motive for the suspected kidnapping. One former FBI and CIA agent posited two potential theories this weekend.

Expert: Suspect may have had issue with Savannah Guthrie

In an interview with NewsNation's Brian Entin on Brian Entin Investigates...