The ongoing legal battle between Kesha and Dr. Luke isn’t likely to end soon.

About a month after the singer dropped her California lawsuit against the producer, Billboard reports that Dr. Luke is suing the singer’s mother for libel—once again. According to the publication, Dr. Luke’s legal team is accusing Pebe Sebert of defamation citing a series of social media posts as well as her recent interview with Billboard.

“After we originally filed suit against Pebe Sebert, she continued to make outrageous, false and defamatory statements against Dr. Luke in her widespread media campaign to damage him and smear his name,” Dr. Luke's lawyer Christine Lepera told Billboard. “Pebe Sebert’s lawyers flat out refused to allow us to add those statements to the existing case or to toll the statute of limitations on them—so we've been compelled to file an additional action.”

In 2014, Dr. Luke filed a similar suit in New York as well as Sebert’s home state of Tennessee, claiming she defamed him with accusations of sexual abuse and drug use. The New York claim was dismissed earlier this year by a judge, but the Tennessee lawsuit carries on.

“This marks Dr. Luke’s second effort to sue a mother for publicly supporting and believing her daughter about being raped,” Sebert’s attorney Alex Little told Pitchfork. “It’s also a transparent attempt to delay the trial of these issues. Mrs. Sebert looks forward to presenting her case to a jury as soon as possible. When the evidence is made public, she expects the jury will conclude that all of her statements have been justified.”