Challengers to the Trump administration’s ban on transgender military service have asked a federal district judge to compel the Family Research Council and the Heritage Foundation to produce records about any communications with the administration that relate to the new policy.

“The purpose of the executive in adopting the transgender ban is squarely at issue in this case, and communications between the executive and advocacy groups like FRC and Heritage about that ban are likely to illuminate its purpose,” wrote Paul R.Q. Wolfson of Wilmer Cutler Pickering Hale and Dorr, counsel to the challengers in the case Doe v. Trump.