A taped appearance of President Obama on the Late Show with David Letterman airs tonight. A pool report by the Washington Post‘s Amy Gardner has a preview of the exchange between Obama and Letterman:

Letterman remarked on how grown-up Obama’s daughters, Sasha and Malia, looked at the Democratic National Convention in Charlotte this month.

“Does that kill you?” Letterman asked.

“It worries me, but they’re surrounded by men with guns,” Obama replied.