What is the primary tool that congress uses to exercise some control over the​ fed?

Senate's Advise and Consent Power

Explanation: The United States Senate has the power to advise and consent on a President's nominees. So, the President is therefore unlikely to make a pick unless it would pass the US Senate.

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well, i can't read it so i'll ask you questions about it : )

if you were a reader and you read the introduction, would you want to read more?

does it start with a question? if so, is it something you would want to read about?

and ask any friends or family for their opinion : )