RALEIGH, N.C. — Attorneys for Army Sgt. Bowe Bergdahl said Saturday they may seek a deposition from presidential contender Donald Trump or call him as a witness at a legal proceeding, saying they fear his comments could affect their client’s right to a fair trial.

Bergdahl’s attorney Army Lt. Col. Franklin Rosenblatt asked Trump in a letter dated Saturday for an interview to discuss the Republican’s comments about Bergdahl, who faces military charges after walking off a post in Afghanistan in 2009. The letter sent to Trump’s New York office by registered mail says the interview would determine whether they will seek to have him give a deposition or appear as a witness at a legal hearing.

Defense attorney Eugene Fidell previously asked Trump to cease making comments about Bergdahl, such as Trump’s comment in October that the soldier was a “traitor, a no-good traitor, who should have been executed.” Fidell also said Trump gave incorrect information about rescue efforts for Bergdahl.