Mexico objects after Texas claims nine islands in the Rio Grande

Texas land commissioner Dawn Buckingham authorized the Texas National Guard to access nine river islands between Laredo and McAllen, citing border security.

The border between Mexico and the United States cannot be changed by a state government's decision.

— Mexico's foreign ministry

Under the 1970 Boundary Treaty, the border follows the middle of the river's normal channel, and only the International Boundary and Water Commission can decide which side each island lies on.