5 USC 2107 - Congressional employee

For the purpose of this title, Congressional employee means
(1) an employee of either House of Congress, of a committee of either House, or of a joint committee of the two Houses;
(2) an elected officer of either House who is not a Member of Congress;
(3) the Legislative Counsel of either House and an employee of his office;
(4) a member of the Capitol Police;

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(5) an employee of a Member of Congress if the pay of the employee is paid by the Secretary of the Senate or the Chief Administrative Officer of the House of Representatives;
[(6) Repealed. Pub. L. 90–83, § 1(5)(A), Sept. 11, 1967, 81 Stat. 196.]
(7) the Architect of the Capitol and an employee of the Architect of the Capitol;
(8) an employee of the Botanic Garden; and
(9) an employee of the Office of Congressional Accessibility Services.