Pub. L. 113-6, div. E, tit. V, sec. 517

Sec. 517. None of the funds made available in this Act may be used to send or otherwise pay for the attendance of more than 50 employees from a Federal department or agency that are stationed within the United States at any single conference occurring outside a state of the United States, except for employees of the Department of Veterans Affairs stationed in the Philippines, unless the relevant Secretary reports to the Committees on Appropriations of both Houses of Congress at least 5 days in advance that such attendance is important to the national interest.