I think that's probably not true either - Trump was claiming fraud at every turn, in the republican primaries as far back as Feb '16 - https://www.theguardian.com/us-news/2016/feb/03/donald-trump...

He also made repeated claims of "large scale voter fraud" in the lead up to the presidential election of that year.

I also feel there's a real difference between "we have evidence Russia's been up to something, and think Trump may be involved" and "Everything that goes against me is stolen! You can't trust anything!"

> I'm not American so I've not been following it that closely.

Neither am I, but from what I can tell the Mueller report came back saying it didn't have enough to pursue, or really link Trump, but something was definitely up. Various Trump supporters went to jail over that report IIRC as well, having lied. Very murky dealings.