Unless he pardons himself. Which would be another whole can of worms are there are those that claim the president’s pardon power is not limited and he and his family can be protected in such a manner.
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The very first political forum I ever tried to participate in was a Scottish newspaper forum, the Herald maybe.
They were welcoming at first, then we all discovered despite my ancestry being Scot, I didn’t know anything at all about politics in that area and offered pretty much nothing to the discussion. I’ve been much happier here.
US Constitution, Article II, Section 2 Pardon clause: “and he shall have Power to grant Reprieves and Pardons for Offences against the United States, except in Cases of Impeachment.”
“Offences against the United States” means federal, He does not have the power to pardon crimes against state law which (for example) would be crimes against the State of New York (for say fraud or money laundering).
“except in Cases of Impeachment” means that he does not have the power to reverse (or pardon) an impeachment action whether against him or any other Federal office holder subject to impeachment (such as federal judges or cabinet members). Impeachment being a political action to remove from office means he can’t stop it, and he would then be eligible for criminal prosecution once he left office.
Now theoretically if he committed federal crimes he could pardon himself, his family, and members of his administration before an impeachment trial was complete. That means no federal prosecutor could touch him, however State prosecutors could still try him under State law violations.
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