The year after passage of the Homeland Security Act of 2002, the Committee's name changed from the Governmental Affairs Committee to the Homeland Security and Governmental Affairs Committee as its jurisdiction expanded to include homeland security issues.
http://www.hsgac.senate.gov/about/jurisdiction
The U.S. House Committee on Homeland Security is a standing committee of the United States House of Representatives. Its responsibilities include U.S. security legislation and oversight of the Department of Homeland Security.
https://en.wikipedia.org/wiki/United_States_House_Committee_on_Homeland_Security
ABSTRACT. The modern concept of U.S. homeland security has existed since 9/11, with the formation of a cabinet-level department devoted to this issue and a refocusing of national policy and resources to deal with th e dangers of terrorism and national disasters that threaten the security and well being of the nation.
http://www.journalhse.org/sft710/kahanjhsearticlefinal2.pdf
What seems to be. needed is a practical definition of homeland security that bounds this concept and. gives it its own areas of concern—striking a balance between an overly. generalized statement that has no real meaning and overly specific issues that are. too narrow and ephemeral.
http://www.journalhse.org/sft710/kahanjhsearticlefinal2.pdf
With the establishment of homeland security, and the linking of domestic security concerns to broader national security interests and institutions, there is a temptation to view homeland security so broadly as to encompass all national security and domestic policy activities.
http://www.journalhse.org/sft710/kahanjhsearticlefinal2.pdf
The Meaning of Homeland Security 8 agree to define homeland security with a single voice,” it is to be expected that different “people, organizations, and jurisdicti ons” will end up doing what they see based on their experiences and overall context (Bellavita, 2008, p. 9).
http://www.journalhse.org/sft710/kahanjhsearticlefinal2.pdf
Whereas the Department of Defense is charged with military actions abroad, the Department of Homeland Security works in the civilian sphere to protect the United States within, at, and outside its borders. Its stated goal is to prepare for, prevent, and respond to domestic emergencies, particularly terrorism.
https://en.wikipedia.org/wiki/United_States_Department_of_Homeland_Security
Congress ultimately passed the Homeland Security Act of 2002 without the union-friendly measures, and President Bush signed the bill into law on November 25, 2002. It was the largest U.S. government reorganization in the 50 years since the United States Department of Defense was created.
https://en.wikipedia.org/wiki/United_States_Department_of_Homeland_Security
The committee conducts oversight and handles legislation (and resolutions) related to the security of the United States. The committee may amend, approve, or table homeland security related bills. It also has the power to hold hearings, conduct investigations, and subpoena witnesses. Additionally, the committee has authorization and policy oversight responsibilities over the Department of Homeland Security.
https://en.wikipedia.org/wiki/United_States_House_Committee_on_Homeland_Security
A number of paths could have been followed in creating a new agency for. homeland security, such as allocating non-homeland security tasks of agencies. transferred to the new department to existing non-DHS agencies or forming new. agencies for these functions.
http://www.journalhse.org/sft710/kahanjhsearticlefinal2.pdf
what is the purpose  and function of homeland security?
The purpose and function of homeland security is to deal with the dangers of terrorism and national disasters that threaten the security and well being of the nation. The purpose and function of Homeland Security is to deal with the dangers of terrorism and national disasters that threaten the security and well being of the nation.