How is “on the part of” used?

In Guardians of the Galaxy (2014), one line is: “I should think that would call for some slight response on the part of the Kree.”

Which movie is “on the part of” from?

The clip at the top of this page is from Guardians of the Galaxy (2014).

I should think that would call for some slight response on the part of the Kree.

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