Before Attorney General William Barr testifies before the House Judiciary Committee on Thursday, Chairman Jerry Nadler wants the Justice Department to hand over a letter special counsel Robert Mueller wrote criticizing the four-page summary of his report.

The Washington Post reported Tuesday evening that Mueller wrote to Barr last month to object to his summary because it “did not fully capture the context, nature, and substance” of the 22-month investigation into Russian interference in the 2016 election and possible obstruction of justice by President Trump.