Yahoo News: Michael Moore's attorney said Monday that the filmmaker's criticism of the Bush administration may have prompted a federal investigation into his trip to Cuba for the upcoming health-care documentary, "Sicko."

In a letter to the U.S.Treasury Department's Office of Foreign Assets Control, attorney David Boies noted that Moore has been a critic of President Bush in his books and films, which include 2004's "Fahrenheit 9/11," a harsh indictment of White House actions regarding the Sept. 11 attacks.

"For this reason, I am concerned that Mr. Moore has been selected for discriminatory treatment by your office," Boies wrote in response to a letter sent to Moore last month from Dale Thompson, OFAC chief of general investigations and field operations.