2.the president is the author of the nations public policies in his or her role of?

commander in chief
chief legislative
chief of party
chief citizen

The answer is Chief Legislator.

Explanation:

The role of Chief Legislator was given to the President of the United States through Article II, Section 3 of the Constitution. As the Chief Legislator, the President has the power to shape the different policies, and at the same time, he has some influence over Congress and its discussion about the bills that it attempts to pass.

Through the different interactions with Congress, the President must encourage it to pass specific bills or to take some actions related to them. The President reviews each bill that has been passed by Congress and he must decide to sign it according to law or veto. Veto refers to the power that is given to the President by the Constitution to reject a bill that has been passed by Congress.  

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.

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