The Congressional power is known as the Supremacy clause.
In Article 6 Clause 2 of the United States Constitution, it states that federal laws are the supreme laws of the land. This means federal laws trump all other laws in the United States. So if the federal government wants to prosecute people for the possession of marijuana in a state where it is legal, they can legally do so thanks to the supremacy clause.
I believe the answer is <span> "expressed" or "enumerated" powers.
Expressed powers refers to the type of powers that are directly written in United States' constitution.
Examples of Expressed powers are: The power to regulate trading relationship with other countries, the power to allocate tax payment into welfare programs, etc.</span>
The policy was called “Don’t Ask, Don’t Tell”.
