Purview, the word is purview.
The problem you have is the Congress delegated that authority to the Executive. This delegation allows presidents to impose tariffs for reasons such as protecting domestic industries, responding to perceived unfair trade practices by other countries, or for national security concerns, as seen in laws like Section 232 of the Trade Expansion Act of 1962.
- National Security: Section 232 of the Trade Expansion Act of 1962 allows the President to raise tariffs on imports that are deemed a threat to national security.
- Unfair Trade Practices: Section 201 of the Trade Act of 1974 allows the President to impose tariffs if an import surge seriously injures a U.S. domestic industry.
Balance of Payments: Section 122 of the Trade Act of 1974 allows the President to enact temporary tariffs in certain international payment situations.
Historical Precedent:
The practice of delegation began in the 1930s and has continued as tariffs became less about revenue and more about foreign policy and economic management.