A "motion to suppress" is a legal request made by a defendant in a criminal case. It asks the court to exclude certain evidence from being presented at trial, usually because it was obtained in violation of the defendant's rights, such as those protected by the Fourth Amendment against unreasonable searches and seizures. If the court grants the motion, the evidence cannot be used against the defendant, which can significantly impact the prosecution's case. This motion is often based on claims that law enforcement did not follow proper procedures or lacked probable cause when gathering evidence.