In May and June, the United States separated more than 2,000 children from their families at the southern border. Caving to pressure, President Trump signed an executive order stopping the policy. But, experts say the damage has already been done. Nadine Burke Harris is the CEO of San Francisco’s Center for Youth Wellness and the author of the new book “The Deepest Well: Healing the Long-Term Effects of Childhood Adversity.” She says these experiences can lead to serious mental and physical health problems through the rest of these children’s lives.