According to the Constitution, this person has only two delineated
responsibilities, assist the president when called upon and ...

President of the Senate

Explanation:

The Constitution lays out in article 1, section 3, that the Vice President of the United States also serves as the President of the Senate

"The Vice President of the United States shall be President of the Senate, but shall have no Vote, unless they be equally divided." - The United States Constitution, article 1 section 3

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