The President declaring laws unconstitutional is not an example of checks and balances, whereas veto power and impeachment are.
The President being able to declare laws unconstitutional is NOT an example of our checks and balances system. The power to declare laws unconstitutional falls under the Judicial branch through judicial review, not the Executive branch. The President's ability to veto laws and the Legislative branch's power to impeach are examples of checks and balances.
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