Theodore Roosevelt believed that the only checks on Presidential Power were

The house of representatives and the people

The Senate and corporation leaders

The constitution and Congress

The federal reserve system and the vice president

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Explanation:

The constitution and Congress.

Roosevelt believed that the Constitution was the law with the most notable authority, which means that as long as his decision does not violate the constitution, the presidential power will be legitimate.

The President should take any necessary action for the public good, except if it is illegal by law or the Constitution. "I did not usurp power," he said, "but I did greatly expand the use of executive power."