Chris Pratt is Guardian of the Kennedy Galaxy – he's determined to defend the former first family over a controversial miniseries about doomed John F. Kennedy Jr. and Carolyn Bessette-Kennedy , RadarOnline.com can reveal.

Married to Katherine Schwarzenegger , Pratt has become fiercely loyal to the family of her mom, Maria Shriver , JFK Jr.'s first cousin, and so he's teaming with his Kennedy kin to wage war on TV magnate Ryan Murphy , who's in charge of the project, which has been titled American Love Story . Article continues below advertisement

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"This situation is especially tricky for Chris because he has become

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