Final answer:
President George W. Bush proposed the plan to create the Department of Homeland Security in response to the 9/11 attacks.
Step-by-step explanation:
The Department of Homeland Security was proposed by President George W. Bush. After the attacks on September 11, 2001, President Bush created the Office of Homeland Security in October 2001. The following year, Congress passed the Homeland Security Act, which established the Department of Homeland Security to centralize control over various government functions and improve coordination in addressing threats within the United States.