The County Executive may be removed from office by the affirmative vote of not less than two-thirds of the members of the full Council after a public hearing and only upon a finding that they are unable by reason of physical or mental disability to perform the duties of the office. The decision of the Council may be appealed by the County Executive within ten days to the Circuit Court by petition. Upon filing of a petition, the Court may stay the removal pending its decision. Upon appeal, the Court shall make de novo determinations of fact.