He is Speaker Hastert's chief of staff, which makes him the key player in the what-did-Hastert-know-and-when-did-he-know-it drama. Scott Palmer has issued a statement flatly denying that Kirk Fordham, Mark Foley's former chief of staff, warned him that Foley was crossing the line with pages long before Foley's inappropriate email surfaced. Palmer's denial of Fordham's headline-grabbing claim is the thread Hastert's Speakership is now hanging by.

In Hastert's brief, evasive press conference on Thursday, sharp reporters immediately zeroed...