To give full credit, the original reporting on this is from NBC News.
The aide denies the allegation. No word, though, if he denied it "vehemently," just like Brett Kavanaugh has with the accusation about him. Also, no tweet from Trump saying that if the charge was true, why didn't the woman file a complaint with the FBI and have them investigate.
Between this resignation and allegation, and Sen. Grassley's aide Mike Davis having to delete his problematically-biased tweet earlier in the week, it's impressive that Chuck Grassley hasn't been even more of a bully to to Dr. Christine Balsey Ford given how this has must be such trying times for him...
P.S. The article tells an even more damning story, with the aide's connection to Ed Whelan, the man who distributed the fake story about Brett Kavanaugh's supposed-doppleganger that was so massively ridiculed and discredited he apologized for it.
You can read the full article here.