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SAN FRANCISCO (Reuters) - The U.S. government is trying to force Facebook Inc to break the encryption in its popular Messenger app so law enforcement may listen to a suspect’s voice conversations in a criminal probe, three people briefed on the case said, resurrecting the issue of whether companies can be compelled to alter their products to enable surveillance.

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FILE PHOTO: People are silhouetted as they pose with mobile devices in front of a screen projected with a Facebook logo, in this picture illustration October 29, 2014. REUTERS/Dado Ruvic/Illustration/File photo

The previously unreported case in a federal court in California is proceeding under seal, so no filings are publicly available, but the three people told Reuters that Facebook is contesting the U.S. Department of Justice’s demand.

The judge in the Messenger case heard arguments on Tuesday on a government motion to hold Facebook in contempt of court for refusing to carry out the surveillance request, according to the sources, who spoke on condition of anonymity.

Facebook and the Department of Justice declined to comment.

The Messenger issue arose in Fresno, California, as part of an investigation of the MS-13 gang, one of the people said.

U.S. President Donald Trump frequently uses the gang, which is active in the United States and Central America, as a symbol of lax U.S. immigration policy and a reason to attack so-called “sanctuary” laws preventing police from detaining people solely to enforce immigration law.

Trump called members of the gang “animals” this year when the Sheriff of Fresno County complained that California laws limited her co-operation with federal immigration enforcement targeting gang members.

The potential impact of the judge’s coming ruling is unclear. If the government prevails in the Facebook Messenger case, it could make similar arguments to force

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