"From the dais of an organization meant to bring nations together, Mr. Trump argued that nationalism can be the foundation for strong nations to join common causes." (NYT.)
Is the object of the preposition the dais of an organization meant to bring nations together a noun phrase in the sentence above?
Yes. the dais of an organization (that is) meant to bring nations together
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Yes.
the dais of an organization (that is) meant to bring nations together
anonymousIs the object of the preposition a noun phrase in the sentence above?
In all grammatical sentences, the complement (object) of a preposition is a noun phrase. That is the case in the example you quoted.