According to this article in the Guardian:
US Republican frontrunner Donald Trump is so confident in his support base that he said he could stand on New York’s Fifth Avenue “and shoot somebody” and still not lose voters.
Obviously this is a rhetorical flourish - as the journalist points out. Nevertheless I'm curious what would happen if a sitting president actually did something like this. What would happen? Would he first have to be impeached and then stand trial? Or would he stand trial straight-away. To be clear, the situation I'm envisaging is not an act of defence, but exactly as reported above: he takes a gun, walks into the street and shoots someone with no provocation. And with plenty of witnesses so the incident itself is in no doubt.
This question is not a duplicate of the above. I'm not asking what would 'occur if a president was put into prison' but asking about how, constitutionally, would the US handle a serious crime alleged of a sitting President and where the crime alleged itself is not in doubt.
Its worth pointing out that the phrase 'high crimes and misdeneamours' according to this article in Wikipedia covers offences particular to the office and so is commensurate with the abuse of powers of that office. It doesn't, on the face of it, cover straight-forward crimes like this.