What did Donald Trump do today?

He said that because someone was polite to him once, he can't be impeached.

On a rare Saturday evening in the White House—though his day still included a conspicuous stop at a Trump-branded property—Trump watched Rep. Debbie Dingell (D-MI) on TV as she mentioned the fact that he had blocked White House staff from testifying before the impeachment inquiry. He immediately lashed out on Twitter:

In other words, Trump is saying that because a grieving widow was polite to him once, she cannot now support his impeachment for the crimes he's committed in office—or talk about his attempts to obstruct investigation into them.

When former Rep. John Dingell died in February, he was given a private funeral and laid to rest in Arlington National Cemetery because of his military service in World War II. Trump's permission was not necessary for either of these things.

So what?

• Even by Trump's standards, this is self-absorbed and petty.