U.S. Agriculture Secretary Brooke Rollins on Sunday said she is suspending imports of live cattle, horses and bison through the southern U.S. border over the damaging pest New World screwworm, a measure that immediately drew opposition from Mexico.

Agriculture Secretary Brooke Rollins announced the immediate suspension of all cattle, horse, and bison imports coming from Mexico amid the “rapid” spread of a deadly parasitic insect known as the New World screwworm fly.

The U.S. has suspended live cattle, horse, and bison imports from Mexico due to the rapid spread of New World Screwworm, threatening livestock and food safety.