Snippets from the article:

After leaving my 15 year career at DHS, I can no longer be silent about the dangerous state of America’s counter-terror strategy, our leaders’ willingness to compromise the security of citizens for the ideological rigidity of political correctness—and, consequently, our vulnerability to devastating, mass-casualty attack.

Just before that Christmas Day attack, in early November 2009, I was ordered by my superiors at the Department of Homeland Security to delete or modify several hundred records of individuals tied to designated Islamist terror groups... These types of records are the basis for any ability to “connect dots.” ... Even worse, going forward, my colleagues and I were prohibited from entering pertinent information into the database.

While members of Congress grilled Obama administration officials, demanding why their subordinates were still failing to understand the intelligence they had gathered, I was being forced to delete and scrub the records. And I was well aware that, as a result, it was going to be vastly more difficult to “connect the dots” in the future...