Cromwell, Burstyn join Stone's 'W'
Cromwell will star as former President George H.W. Bush while Burstyn will play his wife Barbara. The pair join a cast that already includes Josh Brolin (as George W Bush) and Elizabeth Banks (as first lady Laura).
Stone, who has co-written the film with Wall Street's Stanley Weiser, begins shooting W next month.
Cromwell appeared as Prince Philip opposite Helen Mirren in The Queen. Burstyn won an Oscar in 1975 for playing a widow in Martin Scorsese's Alice Doesn't Live Here Anymore. She has also been nominated five other times, most recently for 2000's drug-addiction drama Requiem for a Dream.