U.S. Customs and Border Protection

John Sanders led U.S. Customs and Border Protection under the Trump administration. At least five children died after being detained during the last surge, and he fears "history is repeating itself."

The Customs and Border Protection agency says it is doing its best to reduce impact to the environment and tribal citizens. Conservationists and Native Tribes in the area are not appeased.

McAleenan "wants to spend more time with his family and go to the private sector," President Trump tweeted. He is the latest casualty at the massive agency responsible for protecting U.S. borders.

By Carrie PinkardThere could be a day in the future where people won’t need to shuffle through boarding passes and passports to get on a plane.All they…