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U.S. Customs and Border Protection

Construction has begun on President Trump's border wall between Arizona and Mexico, and conservationists are furious. The massive barrier will skirt one of the most beloved protected areas in the Southwest — Organ Pipe Cactus National Monument, recognized by the United Nations as an international biosphere reserve.

On a recent drive along the borderline, a crew was transplanting tall saguaro cactus out of the construction zone.

Updated at 10:02 p.m. ET

Acting Homeland Security Secretary Kevin McAleenan is leaving his post, the latest casualty at the department responsible for protecting U.S. borders.

President Trump said in a tweet Friday night that McAleenan had done an "outstanding job" but that he wanted to "spend more time with family and go to the private sector."

Trump added that he would announce a new acting secretary next week.

A man stands in front of a biometric face scanner.
Tampa International Airport

By Carrie Pinkard

There 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 would need is their face.

Tampa International Airport may be heading in that direction with their biometric facial scanner pilot program.