The firebrand filmmaker says he has been served with a subpoena by the federal government for a trip to Cuba for his hit healthcare documentary, Sicko. The Treasury Department confirmed two months ago that it was probing Moore's visit to Cuba, during which he was accompanied by some ailing 9-11 rescue workers.

Appearing Thursday on NBC's Tonight Show with Jay Leno, the Oscar winner said that he had just learned backstage that he had been served with an order compelling him to testify about his sojourn to the communist nation.

"I haven't even told my own family this yet," Moore said. "I was just informed when I was back there with Jay that the Bush administration has now issued a subpoena for me going after me for helping these 9-11 rescue workers."

E! News - Moore: I've Been Served - Michael Moore