The new department consisted primarily of components transferred from other Cabinet departments because of their role in homeland security, such as the Coast Guard, the Federal Protective Service, U.S. Customs and Border Protection (which includes the United States Border Patrol), U.S. Immigration and Customs Enforcement (which includes Homeland Security Investigations), the United States Secret Service and the Federal Emergency Management Agency.

[8] By July 2013, Raymond Kelly had served as Commissioner of the New York City Police Department (NYPD) for nearly 12 straight years.

Within days of Homeland Security secretary Janet Napolitano's announcement that she was resigning, Kelly was soon cited as an obvious potential successor by New York senator Charles Schumer and others.

[9] During a July 16, 2013, interview, President Obama referred generally to the "bunch of strong candidates" for nomination to head the Department of Homeland Security, but singled out Kelly as "one of the best there is" and "very well qualified for the job".

[10] Later in July 2013, the online internet news website/magazine Huffington Post detailed "a growing campaign to quash the potential nomination of New York City Police commissioner Raymond Kelly as the next secretary of the Department of Homeland Security" amid claims of "divisive, harmful, and ineffective policing that promotes stereotypes and profiling".

[11] Days after that article, Kelly penned a statistics-heavy Wall Street Journal opinion article defending the NYPD's programs, stating "the average number of stops we conduct is less than one per officer per week" and that this and other practices have led to "7,383 lives saved—and... they are largely the lives of young men of color.