The ninth and possibly final hearing of the congressional panel investigating the January 6 attack on the US Capitol will focus on Donald Trump’s “state of mind” as the insurrection unfolded.

The House of Representatives select committee will reconvene in Washington at 1pm on Thursday after a two-and-a-half month break, and is expected to present new video footage showing efforts to respond to the violence as it was unfolding.

“There is going to be some discussion of events that took place prior to election day and there’s going to be some looking at events that took place after January 6,” said an aide to the committee, who did not wish to be named. “We’re going to bring a particular focus on the president’s state of mind and his involvement in these events as they unfold.

“So what you’re going to see is a synthesis of some evidence we’ve already presented with that new, never-before-seen information to illustrate Donald Trump’s centrality to the scheme from the time prior to the election.”

The committee surpassed many observers’ expectations over the summer with a series of televised hearings that put Trump at the heart of an attempted coup – a premeditated assault on American democracy that sought to overturn the 2020 presidential election.

On Thursday it will seek to reclaim the spotlight less than a month before congressional midterm elections, in which hundreds of Republicans who back Trump’s false claim of election fraud are running for office.

The committee will present documentary evidence that includes information from hundreds of thousands of pages that the Secret Service handed over in response to a subpoena. The records will show how Trump – who encouraged his supporters to “fight like hell” in a speech on the morning of January 6 – was repeatedly alerted to danger yet still tried to stoke the violence, the Washington Post reported.

Unlike previous hearings there will be no live witnesses, the aide said, but there will be new witness testimony, including from individuals who have not been heard from before. It is unclear whether that will include Virginia “Ginni” Thomas, a conservative activist and wife of the supreme court justice Clarence Thomas. Her interview by the panel last month was transcribed but not videotaped.

Thursday’s hearing is expected to last about two and half hours and include statements from the panel’s chair, Bennie Thompson, and vice-chair, Liz Cheney – nearing the end of her tenure in Congress after losing a Republican primary race in Wyoming – as well as all seven other members of the committee, each presenting different elements of the evidence.

Whereas past hearings concentrated on a particular topic, earning comparisons with TV crime dramas or podcasts, this one will take “a step back” and examine “the entire plan”. But in a background briefing with reporters, the aide denied it amounted to a closing argument, saying it was difficult to know the select committee’s schedule going forward.

“The investigation is ongoing and, of course, at some point there will be a comprehensive report released which will present the committee’s findings in a more complete manner. That work goes on. I would resist any characterisation that makes this seem like the final time you’re going to hear from the committee.”