Three House committees sent a letter to attorney general Merrick Garland on Monday demanding information about Hunter Biden’s plea deal, which was put on hold by a federal judge last week after she declared the terms of the deal were “unusual.”

The younger Biden was charged in June with felony gun possession and two misdemeanor counts of failing to pay taxes in 2017 and 2018. He had been set to agree to a plea deal that included a recommendation of probation for the tax violations. Under the deal, the gun charge would have been dropped and potentially wiped from Biden’s record if he met certain conditions.

However, Hunter Biden pleaded not guilty to misdemeanor tax charges in federal court on Wednesday after U.S. District Court Judge Maryellen Noreika put the plea deal on hold.

Now, the heads of the House Judiciary Committee, House Oversight Committee, and Ways and Means Committee are launching an inquiry into the controversial plea deal.