"That was when they suspended the Constitution."
Page One, US Constitution
Creative Commons AttributionPage One, US Constitution - Credit: Caveman

The United States Constitution is the supreme law of the country and the basis of all legal authority on which the country and its federal government is founded. It was adopted in 1787 and ratified in 1788 in the name of ‘the People’.

It is central to the law of the land and the political culture and framework. With this suspended, the US effectively ceases to exist and the regime holds all power.