AI is both a massive opportunity and a big threat. And that is especially true for Google, a tech innovator whose bread and butter business (search) faces an uncertain future in the age of artificial intelligence. Kent Walker is the president of global affairs at Google and its parent company Alphabet. He talks to host Amanda Lang about fending off anti-trust allegations, why Sergey Brin is coming back into the office and the “most fundamental transformation” of the tech giant.