On what two ground have Presidents base their power of Executive privilege ?

Question

http://en.wikipedia.org/wiki/Executive_privilege

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Answer 1

To find the answer to your question about the grounds on which presidents base their power of Executive privilege, you can visit the Wikipedia page on Executive privilege. Here's the link:

http://en.wikipedia.org/wiki/Executive_privilege

Upon opening the page, you can scroll through the content to find the relevant information.