Here is the DOJ's response to Trump's claims that the case should be dismissed because he had absolute immunity as president:
https://storage.courtlistener.com/recap/gov.uscourts.dcd.258149/gov.uscourts.dcd.258149.109.0_1.pdf
There is a table of contents and it is written for public consumption.
Trump has been trying to claim immunity since he was president and so far, the courts have never given it to him
He claimed immunity when Congress wanted his tax returns. SCOTUS said no in 2021.
He claimed immunity with the Mar-a-Lago search in 2022. SCOTUS said no.
Etc.