From his latest piece at Foreign Policy:

“Any discussion of American national security that focuses solely on the issue of U.S. power vis-à-vis other countries — and ignores domestic inputs — is decidedly incomplete…Indeed, by virtually any measure, a closer look at the state of the United States today tells a sobering tale of rapid and unchecked decay and deterioration in a host of areas. While not all of them are generally considered elements of national security, perhaps they should be.”

The full article is well worth the read.