The federal legislature or congress can repeal the state laws under the necessary and proper clause in order to impose federal laws necessary to provide general welfare and common defense of the nation because they have the authority to do so. This authority was given to them because the people believed that the congress would decide for the common good.
Moreover, only the federal legislature has the right to contract debts, lay taxes and if they believed that a state law may prevent the collection of a federal tax, then they can repeal state laws making sure that it is for the benefit of the United States.
The congress has the power to repeal state laws, but can only exercise such power if it is for benefit of the United States. The authority to repeal state laws was vested on the federal legislature and it is towards the general welfare and the defense of the nation.
Further Explanation
This power was vested on the congress mainly because the people understands the congress represent their interest. Besides, the congress has the power to lay and collect taxes, duties, imposts and excises.
It also has the power to pay the debts and provide for the defense and general welfare of the United States.
However, in the United States a law can be repealed by getting a 51 percent of both the senate and the House of Representatives, to pass a vote to remove such law.
For congress to repeal a law, a simple majority votes from both the senate and the House of Representatives is required. The federal laws are divided into three kinds. Statutes; which are enacted by the congress, regulations; which is part of statutes law by the federal department and it is saddled with the responsibility of enforcing the law and constitutional law; this is the highest law in the country.
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