covered legislative branch official

(A) a Member of Congress;

(B) an elected officer of either House of Congress;

(C) any employee of, or any other individual functioning in the capacity of an employee of—

(i) a Member of Congress;

(ii) a committee of either House of Congress;

(iii) the leadership staff of the House of Representatives or the leadership staff of the Senate;

(iv) a joint committee of Congress; and

(v) a working group or caucus organized to provide legislative services or other assistance to Members of Congress; and

(D) any other legislative branch employee serving in a position described under section 13101(13) of title 5.