Usually when Trump makes a wild accusation there’s some dubious peg on which to hang it, like when he claimed that Cruz was behind the ad in Utah from Liz Mair’s anti-Trump Super PAC targeting Melania Trump. That wasn’t true, as even Trump superfan Sean Hannity eventually admitted, but the ad obviously was designed to move votes to Cruz. Trump assumed culpability, wrongly, because Cruz benefited.What’s the peg for this new claim, though? Or have we reached the point where Trump is gaslighting his fans without any tether to reality? In an error-riddled statement released Tuesday night, the Donald...