Based on the political manifestation, the founders of the United States included the "necessary and proper" clause to give Congress the authority or power to legislate for "carrying into execution" the powers of another branch of government.
Another obvious reason that is considered as to why the founders of the United States include the "necessary and proper" is to regard and strengthen the principle of separation of powers.
The necessary and proper clause can be found in Article I, Section 8, Clause 18 of the United States Constitution.
This clause gives the U.S Congress implied powers to carry out other governmental functions other than those specified by the expressed power.
Hence, in this case, it is concluded that the necessary and proper clause gives Congress more powers in the United States.
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