- Stephen Flynn: Donald Trump poses a clear and present danger to the United States
- Electing Trump would undermine all the steps we have taken to create a safer and more secure union, writes Flynn
Stephen Flynn is a professor and co-director of the George J. Kostas Research Institute for Homeland Security at Northeastern University. He is author of "America the Vulnerable" and "The Edge of Disaster: Rebuilding a Resilient Nation." A retired Coast Guard officer, he has advised both the Bush and Obama administrations, including as the homeland security policy adviser for President Obama's 2008 transition team. The views expressed in this commentary are his own.
(CNN)There are three cardinal rules for homeland security, and Donald Trump has been breaking each one with abandon.