A furious Chris Pratt is teaming up with his Kennedy in-laws to wage open war on TV impresario Ryan Murphy , whose next project is a controversial miniseries about doomed couple John F. Kennedy Jr. and Carolyn Bessette-Kennedy , RadarOnline.com can reveal.

Ever since marrying Katherine Schwarzenegger , Pratt, 46, has become fiercely loyal to the family of her mom, Maria Shriver , JFK Jr.'s first cousin. Article continues below advertisement

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"This situation is especially tricky for Chris because he has become the Kennedys' de facto ambassador in Hollywood, where he has a lot of pull," shared an insider.

"Being part of this family and their incredible his

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