16 U.S.C. § 1339
Nothing in this chapter shall be construed to authorize the Secretary to relocate wild free-roaming horses or burros to areas of the public lands where they do not presently exist.
(Pub. L. 92–195, § 10, formerly § 9, , 85 Stat. 651, renumbered Pub. L. 94–579, title IV, § 404, , 90 Stat. 2775.)