Twitter Inc CEO Elon Musk said in an email to Reuters on Friday that hiring law firm Perkins Coie to defend the company in a California federal lawsuit this week was a mistake it would not make again. Reuters reported earlier that lawyers from Perkins Coie entered court appearances for Twitter in the case on Wednesday even though Musk has denounced the firm on the social media platform, including in a tweet last month related to its past work for former Democratic U.S. presidential nominee Hillary Clinton. Musk's email said hiring Perkins Coie was "an error on the part of a member of the Twitter team."