Democrats are investigating whether President Donald Trump’s potential obstruction of former special counsel Robert Mueller’s probe, including whether the president made false statements in his written answers to Mueller, a House Judiciary Committee counsel said in federal court on Monday, Nov. 18.

“Did the President lie? Was the president not truthful in his responses to the Mueller investigation?” House general counsel Douglas Letter told the U.S. Court of Appeals for the District of Columbia Circuit about why the House require access to grand jury material obtained by Mueller, reported CNN.

Letter cited the grand jury testimony of President Trump’s former campaign chairman Paul Manafort, arguing that could shed light on whether the president’s written responses were untruthful. 

President Trump told Mueller in his written statements he didn’t recall discussing WikiLeaks with Roger Stone. But Manafort’s deputy Rick Gates testified that the president and Stone had talked about information following WikiLeaks’s publication of stolen Democratic documents, as reported CNN.

The federal appeals court voiced skepticism over the Justice Department’s reasoning for withholding secret material from the House but also expressed concern that the House could make public secret grand jury details it got.

The House Judiciary Committee had requested that the Justice Department provide the material, which was redacted from Mueller’s report, as part of their ongoing impeachment inquiry against President Trump.  

The D.C. Circuit Court last month granted the Justice Department’s request to temporarily block the release of grand jury materials while the case plays in court.

The House’s arguments followed Stone’s trial this month in which he was found guilty on seven counts stemming from the Mueller probe. President Trump railed against the verdict after it was announced.

“So they now convict Roger Stone of lying and want to jail him for many years to come. Well, what about Crooked Hillary, Comey, Strzok, Page, McCabe, Brennan, Clapper, Shifty Schiff, Ohr & Nellie, Steele & all of the others, including even Mueller himself? Didn’t they lie?” he wrote in a tweet. “A double standard like never seen before in the history of our Country?”