USA Today is making waves by breaking longstanding tradition and weighing in on a presidential election, calling Donald Trump "unfit" for the presidency.

Reaction to USA Today’s unprecedented anti-endorsement has been fast and furious:

More from the Editorial Board:

From the day he declared his candidacy 15 months ago through this week’s first presidential debate, Trump has demonstrated repeatedly that he lacks the temperament, knowledge, steadiness and honesty that America needs from its presidents.

Whether through indifference or ignorance, Trump has betrayed fundamental commitments made by all presidents since the end of World War II. These commitments include unwavering support for NATO allies, steadfast opposition to Russian aggression, and the absolute certainty that the United States will make good on its debts. He has expressed troubling admiration for authoritarian leaders and scant regard for constitutional protections.

Truth.