Which group is part of the Presidential Cabinet?

The Secretary of Homeland Security is indeed a member of the Presidential Cabinet, which is comprised of the heads of the executive departments and various advisors to the president. The Cabinet's primary function is to advise the president on any subject related to their duties, and each member usually oversees a specific department responsible for a range of governmental functions.

The position of Secretary of Homeland Security was created in 2003, primarily to handle issues surrounding domestic security and prepare for threats and disasters. This role emphasizes the importance of national safety and ensures that the government has a dedicated leader focused on protecting the nation from various hazards.

In contrast, the other roles mentioned in the choices represent different branches or parts of government. The Chief Justice is the head of the judicial branch, the Speaker of the House is a legislative leader, and the Majority Leader is a party leadership position in the House or Senate, none of which are part of the executive branch or the Cabinet itself.