(a) For the purpose of this section—

(1) "agency" means—

(A) an Executive agency;

(B) an office, agency, or other establishment in the legislative branch;

(C) an office, agency, or other establishment in the judicial branch; and

(D) the government of the District of Columbia;

(2) "public official" means an officer (including the President and a Member of Congress), a member of the uniformed service, an employee and any other individual, in whom is vested the authority by law, rule, or regulation, or to whom the authority has been delegated, to appoint, employ, promote, or advance individuals, or to recommend individuals for appointment, employment, promotion, or advancement in connection with employment in an agency; and

(3) "relative" means, with respect to a public official, an individual who is related to the public official as father, mother, son, daughter, brother, sister, uncle, aunt, first cousin, nephew, niece, husband, wife, father-in-law, mother-in-law, son-in-law, daughter-in-law, brother-in-law, sister-in-law, stepfather, stepmother, stepson, stepdaughter, stepbrother, stepsister, half brother, or half sister.

(b) A public official may not appoint, employ, promote, advance, or advocate for appointment, employment, promotion, or advancement, in or to a civilian position in the agency in which he is serving or over which he exercises jurisdiction or control any individual who is a relative of the public official. An individual may not be appointed, employed, promoted, or advanced in or to a civilian position in an agency if such appointment, employment, promotion, or advancement has been advocated by a public official, serving in or exercising jurisdiction or control over the agency, who is a relative of the individual.

(c) An individual appointed, employed, promoted, or advanced in violation of this section is not entitled to pay, and money may not be paid from the Treasury as pay to an individual so appointed, employed, promoted, or advanced.

(d) The Office of Personnel Management may prescribe regulations authorizing the temporary employment, in the event of emergencies resulting from natural disasters or similar unforeseen events or circumstances, of individuals whose employment would otherwise be prohibited by this section.

(e) This section shall not be construed to prohibit the appointment of an individual who is a preference eligible in any case in which the passing over of that individual on a certificate of eligibles furnished under section 3317(a) of this title will result in the selection for appointment of an individual who is not a preference eligible.