books. always a pleasure to see you. thank you for being back here. i want to tap into a conversation that you have been having lately. it's in your book. but this idea that our fear, our fear of immigration, this growing phobia is actually going to make america less competitive in the years ahead. a controversial thesis. tell me about it. >> well, immigrants have powered our economy since its inception from the birth of the steel industry, with andrew carnegie, a scottsman with the rise of the semiconductors, to the both of those silicon valley companies, half of which the googles, the yahoos, the companies that power the u.s. economies, were founded by an immigrant to the fact that half all our science and technology phds come from foreign countries. the u.s. is a high-tech country in large measure because it's