A bipartisan group of 48 U.S. lawmakers wants two government agencies to explain a surveillance program in which Yahoo reportedly scanned all the messages of its email users on behalf of the FBI.

After recent news reports of the email scanning program, the Department of Justice and the Office of the Director of National Intelligence need to brief Congress about the efforts, the lawmakers said in a letter to the two agencies.

The first news reports about the program contained “conflicting reports about which legal authority was used” for the email scans, said the letter, organized by Representatives Justin Amash, a Michigan Republican, and Ted Lieu, a California Democrat.

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