Last night, the Donald again displayed the most important factor that disqualifies him from being president: given a choice between the best interests of the country and his self-interest, he will choose the latter every time.

His life has been devoted to himself. He has shown no ability or inclination to change that focus. A president needs to have the capacity to put the country first. He does not.

We most recently see this in his explicit threat to throw the country into turmoil over the election results (note that today, he did say he would not dispute the results, “if I win”). We have seen this in his lifelong pursuit of fame, fortune and celebrity. We even have seen in this election cycle in two new ways. First, in how easily his thin skin is pricked into absurd reactions, most notably his belaboring the “size of his hands” and vouching for the size of his penis. Second, last Spring during the Republican primaries, when he questioned the results of primaries that he lost.

Even good Republicans who quiver at the thought of another Clinton presidency need to wake up to this. They need to vote for Hillary. Do they want a self-centered egomaniac making decisions about war and peace when his foremost considerations as president will revolve around his ego?

Would he sell out allies if Putin stroked him around the ears? Would he use nukes if North Korea belittled him? Would he jail political opponents? Shut down press outlets? Deport American citizens?

We do not know how far his hubris might reach. We should not try and find out.