The US Supreme Court has ruled sweeping immigration raids in Los Angeles can continue for now, lifting a federal judge's order that had barred agents from making stops without "reasonable suspicion".

The Monday ruling is a win for President Donald Trump, who has vowed to conduct record-level deportations of migrants who are in the country illegally.

The 6-3 decision of the conservative-majority court allows agents to stops suspects based solely on their race, language or job, while a legal challenge to the recent immigration sweeps in LA works its way through the courts.

The liberal justices dissented, saying the decision puts constitutional freedoms at risk.