NY Post:

US Sen. Kirsten Gillibrand wasn’t surprised to learn last week that Suffolk County US Rep. Steve Israel was planning to announce as soon as today that he’ll challenge her in next year’s Democratic primary….

Israel, a source said, sent an e-mail to several political allies in the wake of her selection, saying, “Gillibrand says she wants to be able to work with me? Ha, ha, ha.”

But Israel also sent a copy, apparently by accident, to Gillibrand.”