'I fully expect it to be largely unfavourable to my dad,' said Michael Reagan, a radio chatshow host. 'Hollywood has been hijacked by the liberal Left.'
The suspicions of Reagan supporters have been heightened by the casting. The president is played by arch-liberal James Brolin, who is married to Barbra Streisand, one of the former president's harshest critics.
And the film is backed by Leslie Moonves, the CBS chairman noted for his anti-conservative views.
But producer Neil Meron stood by its impartiality, saying: 'This is not a vendetta; it is not revenge. It is about telling a good story in our honest sort of way. We all believe it's a story that should be told.'