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Content: More generally, the president is responsible for making sure "that the Laws be faithfully executed" (§ 3), though the Framers did not specify how the president was to accomplish this goal. The Framers also made no specific provisions for a staff that would assist the president; the Constitution says only that the president may "require the Opinion, in writing, of the principal Officer in each of the executive Departments, upon any Subject relating to the Duties of their respective Offices" (§ 2). To ensure that the president could never become too powerful, the Framers made many presidential powersdependent upon the will of Congress. For example, the president is given the power to make treaties with foreign countries, but those treaties must be approved by the Senate by a two-thirds majority. Similarly, the power of Congress is limited by the need for presidential approval. Congress can create laws, but those laws generally must be signed by the president; if the president refuses to sign a bill, it still can become law if Congress votes to override the president's vetoby a two-thirds majority. The Framers did not divide powers among the branches so much as they required the separate branches to share power, resulting in a complex system of checks and balances that prevents any one branch from gaining power over the others. Modern presidents have greater powers than did their predecessors, as the executive branch has grown over the years to take on more tasks and responsibilities.