1. Short title This Act may be cited as the Heightened Oversight of Travel, Eating, and Lodging Act of 2018 . 2. Limitation on use of Government per diem (a) Definitions In this section— (1) the term agency means— (A) an Executive agency (as defined in section 105 of title 5, United States Code), a military department (as defined in section 102 of title 5, United States Code), or any other establishment in the executive branch (including the Executive Office of the President, the United States Postal Service, and the Postal Regulatory Commission); (B) an office, agency, or other establishment in the legislative branch; and (C) an office, agency, or other establishment in the judicial branch; (2) the term covered individual means— (A) the President; (B) a relative of the President; and (C) with respect to an agency that is an Executive department, the head of the Executive department; (3) the term employee means an individual employed in or under an agency, including an individual employed intermittently in the Government service as an expert or consultant and paid on a daily when-actually-employed basis and an individual serving without pay or at $1 a year; (4) the term Executive department has the meaning given the term in section 101 of title 5, United States Code; (5) the term per diem allowance means a per diem allowance, as defined in section 5701 of title 5, United States Code, or any similar allowance to which an employee is entitled, including any amounts made available to the head or other senior officer of an agency to pay for subsistence or other expenses related to travel; (6) the term relative has the meaning given the term in section 3110(a) of title 5, United States Code