Hmmm It is not the President's job to be moral or nice. A polite man with bad policy will still be a bad president and a rude man with good policy will still be a good president. It's un-Christian to look upon a president as a moral leader. "Render unto Caesar what is Caesar's and what is God's unto God". Was Constantine a good man during his reign?
A progressive would point out here - and I think they would be entirely correct to do so - that this is not the argument that conservatives or evangelical Christians made twenty years ago. Character used to matter. It mattered when conservatives had a problem with Bill Clinton. But it doesn't know?
Social psychologist Jonathan Haidt talks about "can I?" and "must I?" reasoning. (
Reasonable summary.) The brain often works like more like a lawyer than a detective: it starts with what it wants to believe, and then concocts the strongest argument it can for that conclusion. So, for instance, if you start with wanting to believe Clinton is unfit for office, well, the strongest argument against him seems like one based on personal character or morality. But if you start with wanting to believe that Trump
is fit for office, despite his terrible character, then instead your brain goes off and starts producing reasons why character isn't that important.
The progressive argument, and here I think they're correct, is that many on the right have reversed their position along these lines. As long as the allegiance (pro-Republican, anti-Democrat) stays consistent, all of the arguments can change.
Now, one response you might make here is, "You're just assuming things about me. Maybe some people are hypocrites - but I haven't said anything about Bill Clinton. I always believed that character wasn't important in a president." If so, then my response is, "Congratulations on your moral consistency. However, as I personally believe that character is important in a leader, I think character is a compelling argument against Trump. Further, I believe that the most common or mainstream conservative position has indeed been that character matters. You yourself said that values, self-awareness, responsibility, and adherence to an objective morality are key principles of being a conservative - if so, then it seems to me that Trump is not personally a conservative. Do you see any problems with conservatives voting for a candidate who so thoroughly transgresses key conservative principles?"
As far as Christianity goes: I think that argument is very weak. When scripture discusses qualifications for church leadership, personal moral character seems to be paramount: 1 Tim 3 has lists of virtues that bishops or deacons must show. You might argue that church leadership is different to political leadership. In response I would say firstly that there is no separation of church and state in the ancient world, and leadership is leadership; and secondly I would say that scripture talks about great length about the importance of character
for kings. The prophets constantly criticise kings for poor personal morality, as do historians and chronicles. Psalm 101 is a coronation vow for a monarch, and it includes oaths to "study the way that is blameless", to "walk with integrity of heart", and to "not set before my eyes anything that is base". The king vows "perverseness of heart shall be far from me; I will know nothing of evil".
The Hebrew prophets would speak the word of the Lord by condemning personal immorality on the part of rulers. The most striking example is probably 2 Sam 12. The prophet Nathan does not excuse or ignore King David's immoral behaviour, on the grounds that the king is not a moral leader, or that political leaders should be judged on policy rather than character. He goes before the king and demands he repent of the evil he has done, and mend his ways. Psalm 51 picks up that story with David's repentance: David not merely asks God for forgiveness, but pledges to "teach transgressors your ways". Part of David's repentence is promising to serve as a moral example, and to encourage righteousness throughout Israel.
You mention Constantine, and ask whether he was a good man during his reign. The short answer to this is that the sort of Christians who revere Constantine believe that yes, he was. Eusebius'
Life of Constantine is incredibly unsubtle about this. The early Christian defense of Constantine was not "he was a bad man but did the right thing in defending the faith"; it was absolutely that Constantine was a good man. I would note further that Christian history is full of examples of the church demanding penance from political leaders for when those leaders have sinned, or been of poor character. Think of Henry IV, the Holy Roman Emperor, and the road to Canossa; or of Henry II of England's public penance after the death of Thomas Becket. There is ample precedent for the church challenging and even punishing, through excommunication, political leaders who have behaved poorly.
Thus I would encourage Christians who support Donald Trump's policies to
nonetheless criticise Trump's character, in the hopes of provoking moral reform and perhaps even personal redemption. I admit that it seems a really long shot to me - I cannot imagine Trump mending his ways - but all things are possible with God.