If/When the Senate fails to impeach, would Double Jeopardy clause prohibit indictment?

[Hortensis]

9. Trump's reportedly terrified of indictment and prosecution

if he loses the protection of the presidency (presumably in those moments when he admits the reality of the huge legal threats facing him that interrupt happier delusions of invincibility).

Legally, from what's been explained, a failed impeachment trial -- guaranteed by McConnell & Co -- would be irrelevant. The senate acts as a court but isn't one. The judicial system is entirely separate.

Politically? The evidence produced in the senate -- and a president smirking and bragging after the McConnell protected him -- might lead to majority support among the people for prosecution. Or not. But courts are supposed to be independent of that and usually are.

Btw, with events in mind, he's often spoken of the people rising and protecting him, and he's been increasingly encouraging violence in his base and across the far right, including conspiracy and hate groups. So it seems very possible that he could imagine rescue via a glorious uprising that would free him of all legal threats, and constraints? Politically, I'm thinking that might just backfire among voters, of whom currently less than 40% favor beginning impeachment proceedings.