WASHINGTON — Stephen Miller, the White House Deputy Chief of Staff, raised eyebrows Monday during a live CNN interview , when he claimed that President Donald Trump had "plenary authority" to deploy the National Guard in Oregon.

But what is plenary authority, and why is the claim Trump has it such a big deal?

Plenary authority, according to Cornell University's Legal Information Institute , is power "that is wide-ranging, broadly construed, and often limitless for all practical purposes." In this case, it would be Trump having no rules to follow regarding when and where to deploy the National Guard in the U.S.

Cornell Law School notes that it usually refers to powers inherent to the constitution such as Congress' power over interstate commerce.

But Miller's comments, if they are t

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