In an unusual move, the Manhattan district attorney and the Securities and Exchange Commission have rushed to intervene in the Dewey & LeBoeuf bankruptcy case, challenging the trustee’s plans to destroy records and emails that the government said it needs to prosecute the firm’s former leaders.

The face-off could not come at a more critical time for prosecutors. The Manhattan district attorney is preparing for a Jan. 23 retrial against former Dewey chief financial officer Joel Sanders and executive director Stephen DiCarmine, who are accused of misleading firm investors and lenders before the firm’s 2012 collapse.