Of course they colluded with foreign powers. However, it's irrelevant. Since the legalisation of corruption (Trump abolished any enforcement of corruption laws), the US has slid from an already disastrous level of corruption into total degeneracy. It will take years, maybe decades, simply to root out all of the evil that is now in place and by then those who committed treason will either be safely overseas, or their records will have been "accidentally" destroyed, making any investigation impossible.
I would point out, though, that the countries the GOP has historically strong ties with also have extraordinarily high levels of corruption - and have done for a long time - and nobody bothers to do anything about it. This is what Trump is relying on. Once corruption at this level is normalised, everyone just accepts it and moves on.
Worse, I just don't see any serious will to fix the issue amongst any of the other political groups in the US. The Democrats aren't being honest with themselves over why they lost in 2024, and have swung so far to the right themselves that Ronald Reagan would have considered them right-wing extremists.
This is something voters can fix, but almost half of Americans have totally disengaged at this point and the other half believes themselves so powerless that (to use a Douglas Adamsism) they're only concerned with preventing the wrong lizard from being elected.