By now you've probably seen a montage of clips showing then-presidential candidate Donald Trump praising WikiLeaks and its distribution of hacked Democratic emails. It is of course telling that Trump now says he knows nothing about WikiLeaks (if he's being truthful, he really does have an alarming memory problem), but it is far from the most important aspect of this.
What's key here is the degree to which Trump invited and praised the release of emails illegally obtained by a hostile power. Well in excess of 100 times in the closing weeks of the campaign, Trump relied on the Russian handiwork to help his election prospects.