Candidate Trump made remarks that certain members of the House of Representatives belong in jail. Now president-elect Trump has doubled down in a Meet the Press interview on December 8, 2024. From Politico:
“[Former Rep. Liz] Cheney was behind it, and so was [Rep.] Bennie Thompson and everybody on that committee. For what they did, honestly, they should go to jail,” Trump said in the interview.
When asked if he would direct his incoming FBI director and attorney general to send the former committee members to jail, Trump said “No, not at all. I think that they’ll have to look at that, but I’m going to focus on drill, baby, drill.”
Jason Miller says Trump’s suggestion to jail Jan. 6 committee members was taken out of context

I can only speculate that Donald Trump has never read the U. S. Constitution:
The Senators and Representatives shall receive a Compensation for their Services, to be ascertained by Law, and paid out of the Treasury of the United States. They shall in all Cases, except Treason, Felony and Breach of the Peace, be privileged from Arrest during their Attendance at the Session of their respective Houses, and in going to and returning from the same; and for any Speech or Debate in either House, they shall not be questioned in any other Place.
US Constitution, Article1, Section 6
This is the “Speech and Debate” clause that provides members of Congress broad immunity when carrying out their legislative duties.