Environmentalists are now weighing in on the Trump administration's proposed border wall -- claiming it will block migrating animals from finding food and water.
The Sierra Club and others claim border animals are already squeezed into small, fragmented patches of habitat.
More than 100 other endangered species may be impacted by construction of a wall along the U.S.-Mexico border, according to an analysis of U.S. Fish and Wildlife Service data.
Wall supporters dispute their claims.
“Animals have been digging and passing over those natural barriers, probably before man was even here, and they will continue to do that, they're going to know where the end of the wall is,” says Curtis Collier, president of U.S. Border Watch.
Collier says the biggest threat to the environment along the southern border is illegal aliens.
“Destroying vegetation, causing erosion, pollution as paper, I mean metric tons of garbage along the border, there's your real threats to the environment,” he says.
“Then we have the official state of Mexico pumping millions of gallons of raw sewage into the Rio Grande, there's a lot more issues along the border, if we're talking about the environment, that we have to worry about.”