What is the fine-grained topic of the following text: McCain Institute Trustee and former Senate Armed Services Committee member, Sen. Kelly Ayotte, engages U.S. Secretary of Defense James Mattis in a wide-ranging discussion about the threats facing America today, and our preparedness to meet them. Only return the topic.
Discussion on America's preparedness for threats with U.S. Secretary of Defense James Mattis and Sen. Kelly Ayotte