Lawyers delivered closing arguments Wednesday in the trial of Roger Stone, a longtime Republican political operative and confidant of President Donald Trump accused of lying to Congress about his interactions with the president’s 2016 campaign and his connections to WikiLeaks.

Stone pleaded not guilty in January to a seven-count indictment of lying to investigators, obstruction of justice and witness tampering. He faces up to 20 years in prison if convicted. The jury is expected to begin deliberations Thursday.

Stone and his lawyers have questioned prosecutors’ motives for pursuing the case against him, accusing them of trying to exact political retribution against Stone for his association with Trump.

Stone was the last person to be indicted by Robert S. Mueller III’s special counsel team. Trump routinely dismissed Mueller’s investigation into Russian election interference as a “witch hunt” and “hoax.”

But prosecutors argued Stone’s alleged lies to the House Intelligence Committee on Sept. 26, 2017, obstructed the congressional panel’s separate probe into Russian election interference and led lawmakers to issue incorrect conclusions.