Since President Donald Trump shocked the country with hisvictory in the 2016 election, Democrats have attacked Trump with the accusation that he — or at least his campaign — colluded with the Russian government’s hacking of Democratic emails during the campaign.

And yet, as 2017 draws to a close, none of the four investigations into Russian election meddling has turned up any evidence of collusion.

Prominent Democrats have long asserted as fact that the Trump campaign colluded with Russian hacking of Democrats’ emails, despite lacking evidence to support their accusations.