Never happened, this fake story originated with MI6 to coincide with yesterdays Mueller accusation that Manafort is lying, Its just that simple. Trump must declassify everything.
What you said. I wouldn't be surprised if this story originated with Chris Steele himself, with a little assist from Fusion GPS.
IF it happened, why didn't we learn about it before?
WHY was it kept secret until now?
IF it's true, was keeping it quiet leverage?