A House Republican negotiating a comprehensive immigration reform deal warned Friday that full border security is impossible.

Rep. John Carter (R-Texas) said the Southern border is simply too wild for law enforcers to plug all the gaps in the fight against illegal immigration.

“Anybody that thinks you can totally secure the Southern border has never been to the Southern border,” Carter said. “I’ve been down there all my life, and I’m telling you, you can have a 40-foot wall and put machine guns on it, and you can’t secure the Southern border. There’s too much wild country.