Mark Hamill, who plays Jedi prodigy Luke Skywalker in the original Star Wars movies, wrote on Twitter:
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It follows reports the US president is considering presidential pardons for his family, aides and even himself.
Specially-trained prison security teams have been sent to HMP Hewell near Redditch, after trouble broke out on one of the prison's wings.
Household names are among 40 women to sign open letter to BBC Director General saying he must "act now" to end pay discrimination.