Iran has carried out missile tests for what could be a plan for a nuclear strike on the United States, the head of a national security panel has warned.

In testimony before the House Armed Services Committee and in remarks to a private conference on missile defense over the weekend hosted by the Claremont Institute, Dr. William Graham warned that the U.S. intelligence community “doesn’t have a story” to explain the recent Iranian tests.

One group of tests that troubled Graham, the former White House science adviser under President Ronald Reagan, were successful efforts to launch a Scud missile from a platform in the Caspian Sea.

Another troubling group of tests involved Shahab-3 launches where the Iranians "detonated the warhead near apogee, not over the target area where the thing would eventually land, but at altitude,” Graham said. “Why would they do that?”