The Imperial Presidency

What we need is not a new president but a new presidency.

There are few practical limits on presidential power. This is a key dynamic in the failed presidencies of G.W. Bush and Barack Obama.

If you're not familiar with the term The Imperial Presidency, here is an introduction:

Through various means, Presidents subsequently acquired powers beyond the limits of the Constitution. The daily accountability of the President to the Congress, the courts, the press and the people has been replaced by an accountability of once each four years during an election. These changes have occurred slowly over the centuries so that that which appears normal differs greatly from what was the original state of America.

Historian Arthur M. Schlesinger, Jr. popularized the term with his book The Imperial Presidency [9] (Kindle edition) [10], originally issued in 1973 but updated in 2004 to include a discussion of the G.W. Bush presidency. Schlesinger summarized the "World War II and beyond" expansion of presidential powers thusly:

“The weight of messianic globalism was indeed proving too much for the American Constitution. If this policy were vital to American survival, then a way would have to be found to make it constitutional; perhaps the Constitution itself would have to be revised. In fact, the policy of indiscriminate global intervention, far from strengthening American security, seemed rather to weaken it by involving the United States in remote, costly and mysterious wars, fought in ways that shamed the nation before the world.
When the grandiose policy did not promote national security and could not succeed in its own terms, would it not be better to pursue policies that did not deform and disable the Constitution?"

More