In a brief statement released Monday, the FBI confirmed it is investigating the Donald Trump campaign documents that were leaked to reporters in recent weeks after an alleged hack.

The campaign has blamed the leak on “foreign sources hostile to the United States” saying its systems were accessed by hackers working for Iran.

The FBI, which stated as recently as Saturday that it was only aware of media reports on the alleged hack, said Monday: “We can confirm the FBI is investigating this matter.”

The hacked documents included internal campaign communications and a 271-page dossier vetting Trump’s vice-presidential pick JD Vance.

Two Democratic lawmakers on Monday called for more transparency around the alleged hack, including California congressman Eric Swalwell, who tweeted that he was seeking a briefing on the breach:

Democratic congressman Adam Schiff of California stated that the US intelligence community “moved much too slow to properly identify the hacking and dumping scheme carried out by Russia” in 2016 and “should act quickly here”, urging the Department of Homeland Security officials to declassify information on the foreign nature of the hack.

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Donald Trump is scheduled to be interviewed by Tesla CEO Elon Musk on X’s Spaces feature, which hosts live conservations between users.

The conversation is scheduled for 8pm ET:

Musk did not mention how long it will go on for, but did say this:

Good evening, US politics blog readers, and thanks for joining us as we cover Donald Trump’s interview with Elon Musk, the Tesla boss who has lately put his massive wealth to work in support of Trump’s bid to return to the White House. Their interview is scheduled for 8pm ET on X, the platform formerly known as Twitter which Musk bought two years ago, and has since turned into a haven for rightwing misinformation.

We’ll tell you more about Trump’s long relationship with X, but first let’s talk about the moment in which this interview is taking place. We’re less than three months out from the 5 November presidential election, and the Trump campaign has been thrown for a loop by Joe Biden’s decision not to seek a second term, and hand the reins to his vice-president Kamala Harris. Polls of voters taken since the Democrat stepped aside in late July have shown Harris pulling ahead of Trump both nationally and in several crucial swing states, and the former president has appeared unsure of just how to regain the momentum that he seemed to have when Biden was the Democratic standard-bearer.

This evening’s interview will offer Trump the opportunity to do that in an arena he knows well. During his successful campaign in 2016 and almost the entirety of his presidency, Trump used X to do everything from condemning his rivals to announcing policies, until the company’s leaders banned him in the wake of the January 6 attack. Musk reinstated Trump’s account after he bought the platform, but the former president posted only once – until today, when he made eight posts, most of which are campaign videos. We’ll see if he continues to make use of X in the weeks to come.

Here’s what else we will be watching out for:

• Will Musk make any promises to Trump? He’s the world’s richest man, and his money could help the ex-president close the messaging gap with Harris, who has been raking it in ever since she replaced Biden atop the Democratic ticket.

• What will Trump say about Harris? Some of the former president’s attacks against the vice-president seem to have backfired, such as when he implied that she was not actually Black.

• Will Musk push back on any of Trump’s falsehoods? The former president has a tendency to lie, distort and exaggerate, and often clashes with interviewers who challenge him on his facts. We’ll see if Musk follows suit, or lets him talk.