According to the 4th Amendment, what is required for a warrant to be issued?

The requirement for a warrant to be issued under the 4th Amendment is that there must be probable cause. This means that law enforcement must have a reasonable basis to believe that a crime has been committed or that evidence of a crime can be found in the location where the search is to take place. Probable cause is intended to protect individuals against arbitrary invasions by the government, ensuring that warrants are not issued lightly or without sufficient justification.

In contrast, other options like a majority vote in Congress or a police officer's testimony are not relevant to the issuance of warrants. Additionally, while consent from a property owner may sometimes allow for a search without a warrant, it is not a requirement for obtaining a warrant itself. Therefore, the core principle of requiring probable cause is essential to uphold individual rights and the integrity of the judicial process.