WASHINGTON (AP) — Robert Mueller’s Russia investigation has to end with a report. But anyone looking for a grand narrative on President Donald Trump, Russian election interference and all the juicy details uncovered over the past 20 months could end up disappointed.

The exact timing of Mueller’s endgame is unclear. But new Attorney General William Barr, who oversees the investigation, has said he wants to release as much information as he can about the inquiry into possible coordination between Trump associates and Russia’s efforts to sway the 2016 election. But during his confirmation hearing last month, Barr also made clear that he ultimately will decide what the public sees, and that any report will be in his words, not Mueller’s.

Some key questions:

WHAT HAPPENS WHEN THE INVESTIGATION ENDS?

Mueller will have to turn in a report of some kind when he’s done. It could be pretty bare-bones.

Justice Department regulations require only that Mueller give the attorney general a confidential report that explains the decisions to pursue or to decline prosecutions. That could be as simple as a bullet point list or as fulsome as a report running hundreds of pages.

Mueller has given no guidance on what it will be. Asked repeatedly over the past year, Mueller spokesman Peter Carr has cited the regulations and declined to elaborate.

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WHAT DOES BARR SAY HE’LL DO?

Barr said he envisions two reports, and only one for congressional and public consumption.

Barr has said he takes seriously the “shall be confidential” part of the regulations governing Mueller’s report. He has noted that department protocol says internal memos explaining charging decisions should not be released.

During his confirmation hearing, Barr said that he will draft, after Mueller turns in his report, a second one for the chairman and ranking members of the House and Senate Judiciary committees. But here again, the regulations provide little guidance for what such a report would say.

The attorney general is required only to say the investigation has concluded and describe or explain any times when he or Deputy Attorney General Rod Rosenstein decided an action Mueller proposed “was so inappropriate or unwarranted” that it should not be pursued.

Barr indicated that he expects to use his report to share the results of Mueller’s investigation with the public, which the regulations allow him to do. But he hedged on specifics and said his plans could change after speaking with Mueller and Rosenstein.

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WHAT WILL TRUMP DO?

Trump’s lawyer, Rudy Giuliani, has said the president’s legal team wants to review any report before it’s released. Giuliani also raised the prospect that Trump lawyers could try to invoke executive privilege to prevent the disclosure of any confidential conversation the president has had with his aides.

It’s not clear whether the president’s lawyers will get an advance look at Mueller’s conclusions.