A grand jury investigation begun by Special Counsel Robert Mueller III is “continuing robustly,” a U.S. Justice Department prosecutor said Wednesday in arguing for continued secrecy around a case involving a foreign government-owned corporation that has resisted a subpoena.

Justice Department attorney David Goodhand confirmed that the grand jury's investigation was ongoing in response to a question from Chief Judge Beryl Howell, who heard arguments in Washington about whether to reveal the identity of the foreign-owned corporation.

The company, represented by Alston & Bird, has mounted a months-long subpoena challenge, arguing that it cannot be compelled to provide information to the grand jury. The hearing came just days after the conclusion of Mueller's probe and the U.S. Supreme Court rejecting the company's appeal.