Trump is trying to purge anybody from the Republican Party who is not totally “loyal” to him in an attempt to derail whatever further investigations of himself that he can – particularly an examination of the events that led up to the January 6 Capitol attack.
Unfortunately, both parties are pulling back from such inquiries out of their own particular political concerns. The approach needed regarding unearthing what really happened is discussed in Trump's Back - So How Do We Prevent a Cover-Up of the Capitol Attack? [https://alcris2.medium.com/donald-trump-at-cpac-ba85a7374a2b?sk=54d475c7d03b186b87f2ad56b11d3516]. The article also links to how the events leading to January 6 were predicted in the spring of 2020 and what we can do to prevent their recurrence by limiting the very powers of the presidency.