The events prior to the election are of no concern, the only "crime" was committed after the election.
Illegal was a poor choice of words. The argument, as I understand it, is that some of the evidence presented was actually inadmissible.
So don't vote for Trump. If you want open borders, bigger government, stagnant wages, more crime, more government subsidies, more expensive food, energy and housing, vote for Biden. It’s really an easy choice.