Beijing is building its largest military since the 1930s and Matt Pottinger and his colleagues at Stanford are deeply concerned. First as a former journalist, and then as former Deputy National Security Advisor in the first Trump Administration, Pottinger has been watching what Chinese President Xi Jinping both says and does - for decades. He explains to The Cipher Brief's State Secrets Podcast host Suzanne Kelly why those two things are making it very clear that China is on a collision course with the U.S.