When Alejandro Mayorkas was tapped to run DHS – the now 20-year-old behemoth with 260,000 employees created in the aftermath of 9/11 – Mayorkas said that he was determined to be the Secretary of Homeland Security, NOT the Secretary of Immigration. How’s that going? Yesterday, Playbook co-author and Deep Dive host Ryan Lizza sat down with him on the sidelines of the Aspen Security Forum to find out. Mayorkas’s department is charged with preventing foreign and domestic terrorist attacks. It monitors threats from weapons of mass destruction, protects infrastructure and ensures we’re safe from cyber attacks. What many of DHS’s agencies do have in common is that you often don’t hear much about them unless something really bad has happened. So even if Mayorkas didn’t also oversee immigration, the most fraught of political issues, being DHS secretary – responsible for defending the nation against terrorism, computer hackers, nuclear weapons, and natural disasters – can often be a tha...