Final answer:
The author's purpose in the excerpt is to explain the goals of the administration.
Step-by-step explanation:
The author's purpose in the excerpt is to explain the goals of the administration. The author emphasizes that the fundamental task of Congress is to act as a check on the power of a single leader to maintain freedom for the American people. The excerpt also highlights the importance of an independent legislature in preserving freedom. Therefore, the purpose of the author is to provide an explanation of the goals and role of Congress.