Yes, it is true that the presidential authority for executive orders are derived solely from the constitution.
Under Federalism, a president's authority to issue an executive orders must be recognized as from Constitution or Federal law.
The Constitution does outlines the extent of role that the President can carry out. The President (executives) can not carry out the role of the judiciary or legislative.
Hence, if the presidential authority carry out orders are not derived solely from the constitution, such action will be termed as Unconstitutional.
Therefore, it is true that the presidential authority for executive orders are derived solely from the constitution.
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