Restriction of political activity.

No further proscriptions or restrictions may be imposed upon employees covered under this regulation except: (a) Employees who are appointed by the President by and with the advice and consent of the Senate; (b) Employees who are appointed by the President; (c) Non-career senior executive service members; (d) Schedule C employees, 5 CFR 213.3301, 213.3302; and (e) Any other employees who serve at the pleasure of the President.