Republicans can’t simply ignore it when a President their party elects acts in a way that is pointless, cruel, and illegal. Not taking a stand isn’t really an option here if they intend to maintain credibility outside their own political clique.
For Christians, how much more so! The President won the majority of professing Christians; if we intend to be any kind of witness at all, we need to be willing to show that that doesn’t mean he gets a free pass from any of us. The idea that we should refrain from speaking out against injustice, and instead constrain ourselves to pietistic evangelism, ineptly introduces a false dichotomy between the Bible’s commands to do justly and its commands to share the Gospel. Those two sets of commands are not contradictory, and obeying one does not preclude obeying the other.
In fact, if we as Christians refrain from speaking against Trump when he does wrong, I cannot see a compelling case that the Christians who voted for him did so in spite of their disgust at his vile wickedness. It seems more in accord with the facts, if they have no intention of opposing his wrongdoing, that they didn’t particularly care that he was an evil man. Of course the hypocrisy of professing Christians is not an adequate reason to reject the Gospel, but it strikes me that seeing those who claim Christianity abandon its teaching for slight political convenience is, if anything, more likely to interfere with sharing the Gospel.
And yes, I know that the executive order doesn’t ban Muslims, isn’t permanent, was made under pretense of legality, and that many ignorant Republicans believe Obama did the same thing. It remains illegal, under US law that forbids discrimination in immigration on the basis of nationality, pointless, in that no fatal terrorist attack on US soil has ever been carried out by a citizen of one of the seven countries, and cruel, because it shuts out legal permanent residents from their homes.
If Trump keeps his promises (well that’s impossible, since many of them were contradictory, but if he keeps most of them), there will be many things in the next four years that demand condemnation. This is the first that is absolutely clear, and if you miss this one, it’s going to be a long four years. Stand up for something bigger than politics. You don’t have to condemn everything Trump does–some of it’s been good, and he has the potential to do very well indeed later this week if he chooses the right Supreme Court justice (and doesn’t wimp out with someone who’s carefully avoided taking a stand, like Neil Gorsuch)–but when he does wrong, we hemorrhage credibility if we aren’t honest enough to say so.