Impostor (2002)

 

Spencer John Olham is a respected government scientist in the year 2079 trying to devise a secret weapon that will help his fellow humans win a decade-long war with invading aliens that are cloning human subjects and using the replicas as walking time bombs. Suddenly, Olham is accused of being an alien spy and a nationwide manhunt to capture him ensues. With even his doctor wife unsure that she can trust him, Olham must uncover the truth on his own, even as he's relentlessly pursued by Hathaway, a federal agent charged with destroying the clones.

Director: Gary Fleder
Writers: Philip K. Dick (short story) and Scott Rosenberg (adaptation)
Stars: Gary Sinise, Madeleine Stowe and Vincent D'Onofrio
More info: http://www.imdb.com/title/tt0160399/