Have you not been paying attention during Trump's first term? It doesn't matter if there is evidence. Just getting someone on video saying it is enough for CNN/MSDNC/ABC to repeat it 24/7, pounding it into people's heads.
There was no truth to the Steele Dossier, but did that stop the Left from talking about the 'Pee-Pee tapes'?
Yup—we live in a “post truth” world.
That is one of many reasons why this entire matter should have been kept dormant from day one.