Special Counsel Robert Mueller complained in a letter to Attorney General William Barr that his four-page summary of Mueller’s Russia report “did not fully capture the context, nature, and substance” of the investigation’s conclusions, the Washington Post reported on Tuesday.

The Post said it reviewed a copy of Mueller’s letter, which was written in late March after Barr released a summary on March 24 that said Mueller did not establish that members of President Donald Trump’s campaign conspired with Russia during the 2016 election.

In a statement in response to the Post report, House of Representatives Judiciary Committee Chairman Jerry Nadler said Barr “should not have taken it upon himself to describe the Special Counsel’s findings in a light more favorable to the President.” The Democratic lawmaker demanded the Justice Department release a copy of Mueller’s letter by Wednesday morning.

Barr’s four-page summary was released more than three weeks before a redacted version of Mueller’s 448-page report was released to the public on April 18.“The summary letter the Department sent to Congress and released to the public late in the afternoon of March 24 did not fully capture the context, nature, and substance of this office’s work and conclusions.

Barr also said in the summary that Mueller had not reached a conclusion on whether Trump obstructed justice. Barr said he and Deputy Attorney General Rod Rosenstein had found the evidence insufficient to support such a charge.

Justice Department spokeswoman Kerri Kupec, in a statement, confirmed that Mueller wrote to Barr after the summary was released to express frustration over “the lack of context and the resulting media coverage,” particularly about Mueller’s conclusions on obstruction of justice.

Mueller asked Barr to release the report’s introductions and executive summaries quickly, without waiting for the full report to go through the redaction process.“Release at this time would alleviate the misunderstandings that have arisen and would answer congressional and public questions about the nature and outcome of our investigation,” Mueller wrote, according to the Post. Kupec said after receiving Mueller’s letter, Barr called the special counsel and they had a “cordial and professional conversation.”