McNulty: I did it for my kids.

NBC News chief Justice correspondent Pete Williams reported that McNulty wrote a letter to Attorney General Alberto Gonzales, in which he explains, “I intend to step down sometime this summer. The financial realities of college-aged children and two decades of public service lead me to a long-overdue transition in my career.” Watch it:

Williams reported “it’s no secret” that McNulty and Gonzales “have been at loggerheads. They didn’t agree on how to handle the announcement of these firings of the U.S. attorneys.”