What did Donald Trump do today?

He promised to "write" a book explaining why everything about his presidency is going great.

Trump's Twitter feed is often a good barometer of the extent to which he's capable of controlling his emotions on any given day. Today's 22-tweet barrage made it pretty clear that the imminent release of Bob Woodward's book Fear: Trump in the White House had gotten deeply under Trump's skin. 

For the most part, Trump simply insisted that Woodward, the two-time Pulitzer Prize winner whose investigative reporting helped bring down the Nixon presidency, was simply lying about everything. But in the process, he made an interesting promise:

Actually, he probably won't: Trump has his name on about nineteen different books, none of which he wrote himself, according to the man who wrote the best-known of them, Trump: the Art of the Deal. 

Woodward's book is the third insider account of the Trump White House to emerge in the 18 months of his presidency, after reporter Michael Wolff's Fire and Fury and former staffer Omarosa Manigault-Newman's book Unhinged. All three repeat the same central theme: that Trump is emotionally unstable, can't understand the basics of his job, and is being held in check by an increasingly desperate staff--like, for example, the senior Trump administration official who last week words like amoral, anti-democratic, erratic, and petty to describe Trump.

So what?

• A person unfairly accused of emotional instability would probably be able to respond in a way that wasn't emotionally unstable.