Former FBI Director James Comey will reportedly challenge the appointment of Lindsey Halligan, President Donald Trump's former personal attorney, as the interim U.S. attorney in the Eastern District of Virginia.

On Wednesday, Comey pleaded not guilty to criminal charges that Trump demanded. Following the arraignment, Comey's lawyers stated that they would move to dismiss the case for "vindictive and unlawful" prosecution, according to CBS News correspondent Scott MacFarlane.

The attorneys also stated that they would challenge Halligan's appointment, which followed Erik Siebert's removal from the position due to his refusal to charge Comey.

Halligan has no experience prosecuting federal cases and only presented Comey's case to the grand jury after struggling to find career prosecutors in her office who were willing to take on the task.

The Department of Justice made a last-minute decision this week to bring in two prosecutors from North Carolina ahead of Comey's arraignment.