Keep in mind both Nixon and Clinton committed process crimes while in office; they lied to investigators while under oath. Both could, and Clinton did argue they technically did not lie. Nixon was not impeached, so technically, he could be tried for lying under oath after he left office. Neither the RATS nor Ford wanted that to happen, hence the pardon. I believe Nixon knew where the bodies were buried. Clinton was impeached, so he should not face charges for the same offense after leaving office. That should be the standard for Trump as well.
The impeachment system is obviously defective as William Jefferson Clinton has proved.
He was never in any “jeopardy of life or limb” whatsoever. At most he could have lost his job.