It shall not be a violation of any provision of section 1311 of this title to consider the-
(1) party affiliation;
(2) domicile; or
(3) political compatibility with the employing office;
of an employee referred to in subsection (b) with respect to employment decisions.
For purposes of subsection (a), the term "employee" means-
(1) an employee on the staff of the leadership of the House of Representatives or the leadership of the Senate;
(2) an employee on the staff of a committee or subcommittee of-
(A) the House of Representatives;
(B) the Senate; or
(C) a joint committee of the Congress;
(3) an employee on the staff of a Member of the House of Representatives or on the staff of a Senator;
(4) an officer of the House of Representatives or the Senate or a congressional employee who is elected by the House of Representatives or Senate or is appointed by a Member of the House of Representatives or by a Senator (in addition an employee described in paragraph (1), (2), or (3)); or
(5) an applicant for a position that is to be occupied by an individual described in any of paragraphs (1) through (4).
(