Top House Republicans knew for months about e-mail traffic between Representative Mark Foley and a former teenage page, but kept the matter secret and allowed Mr. Foley to remain head of a Congressional caucus on children’s issues, Republican lawmakers said Saturday. The exchanges began with what Republicans now describe as an “overfriendly” e-mail message from Mr. Foley to the unidentified teenager. But news reports about the exchanges have led to the disclosure of e-mail correspondence with other former pages in which the discussions became more and more sexually explicit. Shortly after he was confronted by ABC News on Friday about...