First, yes (and technically he was, twice, just wasn't removed from office). Talking legally/ mostly-objectively here, I think bribery, corruption, and/ or quid-pro may be the easiest to prosecute/ impeach for.
1
Anonymous#27w
And stock market manipulation
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Anonymous#27w
Both of those are high crimes
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Anonymous#17w
Because option 5 is none
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Anonymous#56w
Also, side-note... if we're talking war-crimes, guys, at least the last four presidents probably should have been [debatably] arrested for those lol.