We now know Trump misled Comey about his whereabouts on the night of the famous alleged peeing incident.
That's a peculiar thing to do if you have nothing to hide.
'I don't remember' is an answer that could easily encompass innocence.
'I was elsewhere', not so much. That sounds more like deliberate misdirection.
The Steele Dossier becomes more credible as a result of the misdirection.
And Comey's instincts also suggested that Trump was worried about this particular revelation.
So this raises the possibility that the pee tape exists.