Article continues below advertisementThe disappearance of Savannah Guthrie's mother, Nancy Guthrie, is now being handled by the FBI in addition to detectives in the sheriff's office.NBC News shared the update on Wednesday, February 4, and also revealed Donald Trump personally called the Today star to "assure the Guthrie family that every resource was available as needed."In addition, the president offered "words of support for her and her family as they search for her mother.