Can a Christian support Trump? This is what the Bible says in II Timothy 3,
“But understand this, that in the last days terrible times will come. For people will be lovers of self, lovers of money, proud, arrogant, abusive, disobedient to their parents, ungrateful, unholy, heartless, unappeasable, slanderous, without self-control, brutal, not loving good, treacherous, reckless, swollen with conceit, lovers of pleasure rather than lovers of God, having the appearance of godliness, but denying its power. Avoid such people.”
Based upon Trump’s personal history, personality, and political positions, he certainly fits into the category of someone a Christian should have nothing to do with. And don’t say that he has repented or changed, as he himself is on record as denying the need for repentance or grace. More on Trump and Christianity can be found here.