Polanski's attorneys want a judge to unseal testimony earlier this year by the original prosecutor handling the case, Roger Gunson. They say it will help their efforts to fight Polanksi's extradition from Switzerland, where he remains on house arrest.
Prosecutors on Thursday argued in a court filing that Polanski's motion should be rejected because he remains a fugitive.
A hearing on the issue has been scheduled for Monday afternoon.
Los Angeles prosecutors want the Oscar-winning director returned to face sentencing on a charge he had unlawful sexual intercourse with a 13-year-old girl in 1977.