Who is the second-highest executive officer in the U.S. government?

The second-highest executive officer in the U.S. government is the Vice President. This position serves directly under the President and is crucial in the executive branch of the government. The Vice President's primary role is to support the President and take over presidential duties in the event of the President's incapacitation or absence. Additionally, the Vice President often has key responsibilities in various areas, such as presiding over the Senate and casting tie-breaking votes. This hierarchical structure defines the Vice President as the second in command within the executive branch, solidifying the significance of the role in the U.S. government.