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Rex Features
The writer and director said that Portman was the first pick for his new drama, but she struggled to get into the character of a nun.
He told GossipSauce: "We asked Natalie Portman, and Natalie was very interested but she kept saying she had a problem.
"And we finally nailed down as to what the problem was: she basically said she didn't understand celibacy."
Doubt stars Meryl Streep, Philip Seymour Hoffman and Amy Adams.
Movie Reviews
'Extremely Loud & Incredibly Close' reviewTom Hanks features in a long and winding journey through New York after 9/11
At the Movies
Nicolas Cage viral: GIF snake attackGhost Rider: Spirit of Vengeance star Nicolas Cage demonstrates a snake attack.
Movies Interviews
Nicolas Cage 'Ghost Rider' interviewNicolas Cage on the Ghost Rider reboot, Con Air sequel and pet cobras...
Box Office Charts
'Chronicle' leads UK box officeSuperhero drama Chronicle leads the UK box office ahead of Journey 2.
