

No.
Of course even the president has a right to due process, but no. If the president commits treason, he doesn’t get to be immune to that. A trial is warranted and an arrest if found guilty is correct.
Yes, corruption could hypothetically rig such a trial. But a president immune from the consequences of his actions means there only needs to be one person corrupted to ruin a whole branch of government, instead of the hundreds it would take Congress to rig a trial.
Here’s the text.
“Judgment in Cases of Impeachment shall not extend further than 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.”
Impeachment is important and it should’ve happened, but the senate literally can’t do anything except remove him from office, and the impeachment text specifically allows for regular law to also apply to whoever got impeached.
So no, we do not have this covered by impeachment, and no former president is immune from regular legal proceedings.
Current presidents are, though, through supreme court precedent and the self-pardon. Former presidents should not automatically get this benefit though.