"This FY 2019 Contingency Plan covers Department of Justice (DOJ or the Department) operations during a lapse in appropriations. The Antideficiency Act restricts the Federal Government's ability to obligate funds in advance of appropriations or beyond appropriated levels. During a lapse in appropriations, the Department will only continue the following categories of activities: 1. Those funded by a source that has not lapsed, such as permanent indefinite appropriations and carryover of no-year funds appropriated in a prior year; 2. Those for which there is an express authority to continue during an appropriations lapse; 3. Those for which authority to continue during an appropriations lapse arises by necessary implication; 4. Those related to the discharge of the President's constitutional duties and powers; and 5. Those related to 'emergencies involving the safety of human life or the protection of property,' 'i.e.', where there is a reasonable likelihood that the safety of human life or the protection of property would be compromised, in some significant degree, by delay in the performance of the function in question."
U.S. Department of Justice: https://www.justice.gov/