Don Lemon Tweets Apology to CNN Colleagues

Don Lemon returned to "CNN This Morning" following his comments about presidential hopeful Nikki Haley. The controversy erupted when he questioned Haley's age on last week's show. Before his appearance on the morning show, he tweeted: "To my network, my colleagues and our incredible audience — I’m sorry. I’ve heard you, I’m learning from you, and I’m committed to doing better."