Article II Section 4
The President, Vice President and all Civil Officers of the United States, shall be removed from Office on Impeachment for, and Conviction of, Treason, Bribery, or other high Crimes and Misdemeanors.
They have to be in one of those positions when the House impeaches them...
I never said they could impeach Trump on November 9th, or are you assuming my use of 'day one' refers to being president elect and not president is enough? If so, that would be rather silly.
Article I Section 3
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...
and all you can do is remove them and prevent them from holding another position.
Correct, however that does change criminal/civil liability, the portion of that clause you happened to edit out.
But to prevent them having another position, you have to charge them while they're actually in the old one.
Except A2S4 doesn't end with "committed during the tenure of that particular term in office", nor any mention of a statute of limitations for offenses committed in or out of office which could lead to impeachment.
If what you are saying is true... a sitting vice-president who assassinates the sitting president, they would not be subject to impeachment because the crime occurred in their former office?
You can't do it from hindsight.
Says who? There are different legal theories as to the power to impeach, the meaning of 'high crimes & misdemeanors' as just one major one (ie is it required for congress to pass a law defining impeachable offenses? some say yes). It's hard to call this an ex-post facto issue, and given you forgot about:
Article I, Section V
Each House may determine the Rules of its Proceedings, punish its Members for disorderly Behavior, and, with the Concurrence of two thirds, expel a member.
You know what that means? It is fully within the power of the house to draft & vote on articles of impeachment on a random federal official every week! The reasoning it could simply be "for the fashion crime of wearing white after labor day"... even in the form of white cotton briefs.
Likely? No, but fully within their power.
"But, but, the courts!" some would say, who should then be pointed to
Article I, Section 2
The House of Representatives shall chuse their Speaker and other Officers; and shall have the sole Power of Impeachment.
No court would dare touch this matter for fear of being accused of involving themselves in a matter which is rather explicitly enumerated as an exclusive power to the congress, for fear that any judge who did would be the next to be impeached.
Why is that the people most interested in shouting "Constitution!" are the same ones who don't know what it says, and will be first to argue about what it means if you call them on it?
Why is the people who copy & paste bits of the constitution to try to explain their disagreement with someone often don't fully think through their arguments? Yes, some of mine are rather outlandish & unlikely, they do at least test the theories you attempt to raise.