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The discovery of documents with classified markings in a Washington, DC, office used by President Joe Biden after his time as vice president might have been a relatively small story that got little attention.

But it is a very big deal in large part because former President Donald Trump, who wants to run against Biden in 2024, waged and lost a public war against the National Archives over presidential documents.

The circumstances of the classified documents apparently kept by the two men appear to be so different as to defy comparison, as CNN’s Stephen Collinson notes, although at the very least, it’s not a good look for Biden’s lawyers to have discovered any classified documents at his former office.

Back in September, Biden said Trump’s treatment of documents was “totally irresponsible.”

Responding to a “60 Minutes” question about an image of classified documents spread across the floor at Trump’s Mar-a-Lago resort, Biden said his reaction was: “How that could possibly happen. How one – anyone could be that irresponsible. And I thought, ‘What data was in there that may compromise sources and methods?’ By that I mean, names of people who helped or th– et cetera. And it just– totally irresponsible.”

Now he will have to answer questions about his own treatment of documents.

While Biden’s lawyers quickly turned the few classified documents they discovered over to the National Archives and Records Administration, areas of Trump’s primary residence at Mar-a-Lago were searched by the FBI last summer after he misled and stonewalled about the existence of boxes of documents.

Both men’s treatment of classified documents is now under active investigation by lawyers from Department of Justice.

Here’s what we know so far about the Biden classified documents and what happens next. Much of this comes from reporting by CNN’s Jamie Gangel and from a statement by Richard Sauber, special counsel to the president.

They were discovered in a locked closet in an office used by Biden as part of his relationship with the University of Pennsylvania. The Penn Biden Center for Diplomacy and Global Engagement is the University of Pennsylvania’s home in Washington, DC, and it opened with a ribbon cutting in 2018 in a building across Constitution Avenue from the US Senate, where Biden spent much of his career. Biden was an honorary professor at the University of Pennsylvania from 2017 to 2019.

The documents were found in early November – a week before the midterm elections – by Biden’s attorneys.

CBS News reported Monday that Attorney General Merrick Garland assigned a prosecutor, the US Attorney in Chicago, to review the documents.

It technically wasn’t announced at all. CBS’s report on the involvement of the US Attorney in Chicago was the first public word about these documents. It’s not clear if their discovery will lead to any official action, court case or report.

Attorneys for the president found the documents as they were closing down the office he used in Washington, DC, according to Sauber. That’s an important distinction with the Trump classified document situation. Biden’s private attorneys found the documents and then notified the National Archives. For Trump, the National Archives spent more than a year pursuing documents from his time as president and pursued legal avenues all the way to the Supreme Court.

There were fewer than a dozen documents found and Sauber said they “appear to be Obama-Biden administration records.”

For comparison, Trump refused to turn over hundreds of documents marked either secret or top secret.

Gangel and CNN’s Marshall Cohen reported Tuesday that, according to one source, the Biden documents covered topics including Ukraine, Iran and the United Kingdom.

Gangel reported that the classified materials included some top-secret files with the “sensitive compartmented information” designation that is used for highly sensitive information obtained from intelligence sources.

Related: What to know about government classification of secrets

John R. Lausch is the US attorney for the Northern District of Illinois. Garland may have gone to Lausch for this investigation since Lausch was appointed to the position by Trump in 2017 and thus would avoid the appearance of a conflict of interest that a Biden-appointed prosecutor would face, people briefed on the matter told CNN’s Cohen and Evan Perez.

Nothing publicly. For comparison, Garland only spoke in public abut the search of Mar-a-Lago after Trump publicly announced the search was occurring. Trump’s attacks on the FBI led to a surge in threats against agents.

Biden’s attorneys immediately informed the National Archives and turned them over to Archives officials the next day, according to CBS.

Gangel’s source told her the Archives views the situation as a mistake.

Nothing yet. He is in Mexico City meeting with other North American leaders. CNN’s White House team reports that neither Biden nor his White House legal team know what is precisely contained in the documents. They did not review the documents found in his private office before they were given to the National Archives.

Rep. James Comer, the Kentucky Republican who now chairs the House Oversight Committee, told CNN he plans to send a letter to the Archives within the next 48 hours seeking more information.

House Speaker Kevin McCarthy suggested the Biden example proves the motivations behind seeking the classified documents Trump took.

“I just think it goes to prove what they tried to do to President Trump overplayed their hand on that,” McCarthy said.