House Democrats tell The Daily Beast they’ve been told Special Counsel Robert Mueller is willing to testify before them about his report on Russian interference in the 2016 election but that the Department of Justice has been unwilling to set a date for it to happen.

The impasse comes as lawmakers have grown increasingly frustrated over Attorney General Bill Barr’s handling of the release of the Mueller probe and as other Trump World figures have declined to appear before congressional committees.

Shortly after it was reported on Tuesday night that Mueller had written and called Barr to complain that he not fully represented his findings, House Judiciary Committee Chairman Jerry Nadler (D-N.Y.) sent out a statement demanding both appear before his committee and revealing that he had been stonewalled so far.