The U. S. Congress claims

which are powers that best completes but not directly stated in the Constitution.

Word Bank:

The U. S. Congress claims implied powers, which are powers that best completes its enumerated powers, but are not directly stated in the Constitution.

Explanation:

The Implied Powers theory was first expressed by Alexander Hamilton on February 23, 1791; it is applied to the case law of the United States Supreme Court, in particular to extend the jurisdiction of this court to the courts of individual federal states where they are not constitutionally provided for. The extension in particular concerns powers not foreseen by the Constitution but necessary to be able to experience those expressed in the Constitution of the United States, and it is applicable both for the Congress and the Supreme Court.