There are 15 cabinet posts that have departments in the US government. There are also 8 cabinet level posts that do not have a department including the vice president.
All the Cabinet posts are the president's appointees.
The President's nominations for cabinet posts are vetted by the US Senate which has the power to reject them if they wish.
Condoleezza Rice held two cabinet posts in the George W. Bush administration. She served as the National Security Advisor from 2001 to 2005 and then became the Secretary of State from 2005 to 2009.
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29 posts
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The senate then holds confirmation hearings on the president's nominees for cabinet posts. The nominee to head each department appears before the Senate committee that oversees the department to answer questions about his or her background or views.
The Cabinet is an advisory group selected by the President and approved by the Senate to aid the Chief Executive in making decisions. The Cabinet may also include the Vice President and the heads of major departments. The first Cabinet posts were Secretary of State, Secretary of the Treasury, Attorney General, Postmaster General, and Secretary of War (defense).
Trump has not yet taken office. None of his nominations for cabinet posts have been confirmed yet. Some of them are quite controversial.
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James Monroe served as Secretary of State and later as Secretary of War under James Madison.
In the US System, Cabinet positions are in the Executive Branch. Holders of cabinet posts are nominated by the President (or electee president). Confirmation comes from congress. Not all nominees are approved. The Cabinet positions are partly determined by constitutional designation (secretary of state for example) and partly created by legistlation that creates new government departments (environmental protection). Some posts have been combined. Originally there were secretaries of war and Navy. These are now combined in Secretary of defense.