Bullshit. Only an idiot would believe the republicans receiving that letter wouldn't immediately make it public, especially this close to an election.
Then those particular "Republicans" are responsible. Now... Who were "they"?
Comey knew it would immediately become public. That's why he sent his other letter.
On Friday night, Comey sent a peculiar and
unusual memorandum to F.B.I. employees, purporting to justify his decision to write to Congress on the eve of the election. Alternately self-righteous and self-pitying, the message portrayed Comey’s decision as obligatory under the circumstances. He wrote:
Of course, we don’t ordinarily tell Congress about ongoing investigations, but here I feel an obligation to do so given that I testified repeatedly in recent months that our investigation was completed. I also think it would be misleading to the American people were we not to supplement the record. At the same time, however, given that we don’t know the significance of this newly discovered collection of emails, I don’t want to create a misleading impression. In trying to strike that balance, in a brief letter and in the middle of an election season, there is significant risk of being misunderstood . . .
Comey says that he didn’t “want to create a misleading impression,” but that’s precisely what he did. He had to know that his vague letter to Congress virtually demanded elaboration from “senior government officials,” who would apply their own gloss, in the form of leaks. The responsibility for the confusion sown by these leaks, if not for the leaks themselves, belongs only to Comey. If the outcome of the Presidential election turns on Comey’s action, that’s his burden, and the nation’s, too.
James Comey’s Letter and the Problem of Leaks - The New Yorker