The executive branch
Vice President
First in the line of succession, President of the Senate with a tie-breaking vote, and whatever else the President delegates. The job's power is almost entirely informal.
In full
The Constitution gives the office two duties: succeed the President, and preside over the Senate, voting only to break a tie. Everything else is delegated, which is why the role has ranged from ceremonial to central depending on the administration. Under the Twenty-Fifth Amendment the Vice President is also the person who, with a majority of the Cabinet, can declare a President unable to serve.
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.