Courts will strike down legislation for which of the following reasons?

Legislation can be struck down by courts primarily on constitutional grounds or due to a defective legislative procedure. When a law is deemed unconstitutional, it may violate principles established in the Constitution, such as infringing on individual rights or failing to maintain the separation of powers. Courts have the authority to review legislative actions to ensure that they adhere to constitutional standards.

Additionally, if there was a procedural error during the creation of the legislation—such as failing to follow proper legislative processes or requirements—this could also be grounds for invalidating the law. Courts serve as a check on the legislative branch, ensuring that laws are not only legally sound but also created in a manner consistent with established procedures.

In contrast, the other options do not typically provide a valid basis for courts to strike down legislation. Lack of public support is a political consideration rather than a legal one, and insufficient funding is more related to administrative issues, which do not directly impact the legality of the legislation itself. Overlap with common law may lead to complications in legal interpretation or enforcement but does not constitute a constitutional issue warranting invalidation.