President Trump will try to use his Executive Privilege powers to try and circumvent the House's inquiry and investigation as to the January 6, 2021 Insurrection. However, his attempts should fail because he is no longer the sitting President. He is just a civilian now.
Remember this people with Steve Bannon. If he is decides to eventually testify in front of Congress. He doesn't want to, but he'll be forced by Biden's Justice Department. Does he try to turn it into a circus with full trumpets and trombones playing? Anyway, once he takes the oath on the Bible, he won't be able to plead the Fifth Amendment. He loses that privilege of not testifying and not incriminating himself because of the pardon President Trump gave him. He'd potentially be admitting to the guilty things he was originally charged with, i.e., the bribery and the extortion and the corruption charges in the funding of the Border (Southern) Wall. How much money did he steal from that? Anyway, President Trump pardoned all of that plus all of the obstruction charges and the witness tampering charges in the Mueller Investigation. If he tries to plead the Fifth Amendment then he puts himself back into jeopardy. Will he be imprisoned again? That's up to the Courts. Because once the Biden Administration and Biden's Justice Department have him on testimony, who knows? It becomes a slippery slope. - Then this would end up on the Washington D.C. Court calendar on some docket for a future date. Stay tuned.
A legal quagmire for Constitutional scholars and legal experts for sure.