The Arizona sheriff under fire for failing to find Nancy Guthrie may lose his job after county officials move to oust him over accusations of perjury. The move comes as the search for Nancy Guthrie, 84-year-old mother of “Today” show host Savannah Guthrie, hits its 90th day on Friday. Sheriff Chris Nanos of Pima County, who faces action from county officials over alleged perjury Rebecca Noble for NY Post At least two members of the Pima County Board of Supervisors will file a motion to vacate the sheriff’s office if embattled Sheriff Chris Nanos doesn’t step down by Tuesday, the two officials told Fox News. The supervisors claimed Nanos lied under oath about his record as a cop in El Paso before joining the sheriff’s department in the 1980s, covering up suspensions that ultimately forced him to resign in lieu of termination. Critics have blasted Nanos for alleged missteps in the search for Nancy Guthrie or the kidnapper who snatched her from her home on February 1.…