Last year Donald Trump called Nancy Pelosi, the House speaker, a “nasty, vindictive, horrible person.” Actually, she isn’t — but he is.

Trump’s vindictiveness has become a major worry as the election approaches. He has already signaled that he won’t accept the result if he loses, which seems increasingly likely though not certain. Nobody knows what chaos, possibly including violence, he may unleash if the election doesn’t go his way.

Even aside from that concern, however, a defeated Trump would still be president for two and a half months. Would he spend that time acting destructively, in effect taking revenge on America for rejecting him?

Well, we got a preview of what a lame-duck Trump presidency might look like Tuesday. Trump hasn’t even lost yet, but he abruptly cut off talks on an economic relief package millions of Americans desperately need (although as of Thursday he seemed to be backtracking). And his motivation seems to have been sheer spite.

Why do we need economic relief? Despite several months of […]