Gerard Butler has joined a new political action movie called Olympus Has Fallen. (DIGITAL SPY)

The film focuses on a former Secret Service agent, to be played by Butler, trying to stop a terrorist attack on the White House.

Creighton Rothenberger and Katrin Benedikt have penned the script, while a director has yet to be hired, according to The Hollywood Reporter.

Butler, who recently finished a stay in rehab for substance abuse, will be co-producing the film.

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