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Suppose President Bush doesn't like a law and is supposed to execute it, but he does not. What would happen?
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The solution tackles an imagined situation (please see long description) and its consequences where the country's chief executive does not execute a supposed law due to personal preferences.
The President of the United States is the constitutional chief officer of the executive branch, but that is not the same as being the entire executive branch.
Executing laws is certainly not the sole responsibility of George W. Bush. When was the last time you saw President Bush running around attending to every little detail of public policy in order to ensure the rules were enforced in every little nook and cranny of the vast nation that is the United States. The agencies of the federal government attend to those things.