A Constitutional crisis is a time when ordinary governance by the national government becomes impossible.
A Constitutional crisis is a situation exemplified in 1868 when Johnson and Congress disagreed about whether Johnson had violated the law by trying to fire the secretary of war, Edwin Stanton.
A Constitutional crisis is a situation exemplified by when Nixon and Congress disagreed about the contours of presidential authority, including executive privilege.
A Constitutional crisis is an event demanding some change to the Constitution. If constitutional reform is not needed, or at least not urgently needed, then it is normal politics.
A Constitutional crisis is a situation that could also be said to exist whenever there is deep and persistent dissatisfaction with a constitutional system.
A Constitutional crisis is closely related to a political crisis, which occurs when normal political bargaining and compromise are replaced with an impasse with no obvious end.
A Constitutional crisis is best understood by analogy with financial crisis, economic crisis, military crisis, or political crisis, where the system in question freezes up into an impasse, generating uncertainty about the nation's capacity and possible consequences.
A Constitutional crisis is a time in which normal politics is pushed into the background. In extreme cases, government officials may not be able to take routine actions or make ordinary decisions because of uncertainty about lines of authority and government powers.