A U.S. judge on Wednesday delayed the planned Dec. 18 sentencing hearing of President Donald Trump¡¯s former national security adviser, Michael Flynn, but did not set a new date.

Judge Emmett Sullivan had been expected to put off sentencing after both Flynn, who has pleaded guilty to lying to FBI agents, and the United States filed a joint motion to request the delay, citing the expected December release of the Justice Department inspector general¡¯s report on the origins of investigations into alleged Russian election interference. The inspector general said last week he expects to release the report on Dec. 9.

¡°The parties expect that the report of this investigation will examine topics related to several matters raised by the defendant,¡± they wrote in the joint filing.

Flynn pleaded guilty in 2017 to lying to agents about his 2016 conversations with Sergey Kislyak, then-Russian ambassador to the United States. The retired Army lieutenant general is one of several Trump aides to plead guilty or be convicted at trial in special counsel Robert Mueller¡¯s investigation into Russian interference in the 2016 U.S. election.