Bush's claims to and interpretations of executive privilege endangered the principle of the separation of powers.
The principle of the separation of powers recognizes that the three branches of government are separate and equal and perform different roles.
The three branches are the legislature (Congress), Executive, and Judiciary.
While Congress makes laws, the Executive implements the laws, leaving the Judiciary to interpret the laws.
Thus, the main constitutional issue regarding Bush's claims to executive privilege was that his interpretations of executive privilege endangered the principle of the separation of powers.
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