Collusion is a very difficult thing to prove, and I'm one of those individuals that's all about facts over speculation. I don't think that Donald Trump colluded with Russian officials to undermine the 2016 election, I think that Donald Trump is an attention whore who wanted to exploit his name and image in as many ways possible and that included bumping elbows with Russian oligarchs. Up until the massive shift in momentum where the likelihood of being elected completely flip-flopped between Donald Trump and Hillary Clinton, Trump was already screaming about how the election was rigged and he implied that when Hillary wins it will be because she gamed the system.
I honestly don't expect Donald Trump to win in 2020, but I didn't expect him to win in 2016 and look what happened. I think that the shock to everyone's system is still wreaking havoc on our nervous systems.