From the piece:
In 2008, just after Barack Obama was elected president, I gave a television interview regarding what the Obamas might expect on becoming the new first family. I was asked specifically how Malia and Sasha’s lives would change. For a start, I said, they won’t play outside anymore without armed guards.
I know something about that. For the eight years that my grandfather, Dwight Eisenhower, was president of the United States, I had Secret Service protection. Known as the “Diaper Detail,” these armed agents protected my sisters, brother and me from potential kidnappings or other targeted attacks. Such threats might be aimed at hurting us, but they would also strike a devastating blow to the president and possibly our national security.