You apparently haven't read the two main points of Trump's legal argument for presidential immunity:
1. The President is immune from prosecution for acts taken during the official conduct of his office.
2. The plain language of the U.S. Constitution may grant him immunity under the "double jeopardy" clause written into the provisions on impeachment:
Judgment in Cases of Impeachment shall not extend further than to removal from Office, and disqualification to hold and enjoy any Office of honor, Trust or Profit under the United States; but the Party convicted shall nevertheless be liable and subject to Indictment, Trial, Judgment and Punishment, according to Law.
President Trump was ACQUITTED in his impeachment trial over the 1/6 fiasco.
Thanks for elucidating what the issues are in this case.