The Department of Justice is preparing to ask the White House to invoke executive privilege to prevent the release of the full report by special counsel Robert Mueller, according to a letter Assistant Attorney General Stephen Boyd sent the House Judiciary Committee on Tuesday evening.

In the letter obtained by several news outlets, Boyd said the move is in response to Democrats’ plans to vote on holding Attorney General William Barr in contempt on Wednesday, following a breakdown in discussions between House Judiciary Committee staffers and the DOJ. The Justice Department reportedly offered to let the 12 lawmakers whom it’s already given permission to view a less redacted version of the report the chance to bring two staffers with them instead of one, sources familiar told Politico. The DOJ did not offer to allow additional lawmakers to view the report.

In a counterproposal later Tuesday, Rep. Jerry Nadler (D-NY) asked that the full Judiciary and Intelligence Committees from the House and Senate gain access to the less redacted report. Nadler also asked that a committee be formed to support lawmakers’ efforts to access grand jury material or, at the least, not oppose efforts to get it and he requested a meeting to schedule the release of underlying materials from Mueller’s probe.

The DOJ rejected that offer, calling it “unreasonable.”

In a statement Tuesday evening, Nadler called the decision to “abruptly” invoke executive privilege was “dangerous.”