WASHINGTON — Robert Mueller and House Democrats have been unable to reach an agreement on how much of the special counsel’s expected congressional testimony would be public, and how much would take place in private, according to people familiar with the matter.

The special counsel’s office has been quietly negotiating with the House Judiciary Committee, whose chairman, Rep. Jerrold Nadler, D-N.Y., has been eager to have Mueller testify as soon as possible.

Mueller, according to people familiar with the matter, would like for any discussions beyond the public contents of his report to be conducted in private. Democrats want to press Mueller in a nationally-televised hearing about a host of issues, including whether he thought President Trump could or should be charged with obstruction if he were not the president, and whether Mueller agreed with Attorney General William Barr’s handling of the investigation’s findings.

The attorney general released a lightly redacted version of Mueller’s 448-page report a month ago, and ever since Democrats have been pushing for Mueller to testify.