Lawyers representing Nick Sandmann, the teen in the viral video with a Native American elder in a protest in Washington, D.C., have sent an evidence-preservation letter to Atlanta-based CNN and other media companies in preparation for potential defamation litigation.

CNN communications contacts did not have an immediate response.

Atlanta defamation attorney L. Lin Wood and trial lawyer Todd McMurtry of Hemmer DeFrank Wessels in Fort Mitchell, Kentucky, announced last week that they've been retained by the family of Nick Sandmann, 16, a Covington Catholic School 11th-grader.