God severely punished David for his sin and that punishment caused destruction across all of Israel. David’s punishment was extreme family strife which ended in a terrible civil war. This punishment came even though David repented after the Prophet Nathan confronted him.
In contrast, Trump has never repented for any of his sins. Instead he has arrogantly boasted of his affairs with married women and has publically stated that he has not asked God to forgive him. If we elect Trump, we are signing the death warrant of the social conservative movement.
By that standard, Bush 1 and 2 must have been doing a LOT of unrepentant sinning.
David’s visibility as king of Israel made his reputation be intimately tied up with the Lord of Hosts. The bible says he gave occasion for God’s enemies to blaspheme.
Trump is not currently in this danger. To those whom God gives much, God requires much.
Also people keep on (and I wonder sometimes if it is deliberately) misrepresenting Trump’s comments to a secular interviewer, which he is as wary of as a mongoose would be of a cobra snake. He said that he tried not to sin — i.e. we could quite readily read between the lines that he doesn’t believe in cheap grace. A good sign, not a bad one. He would need an interview with someone of the known faith stature of Franklin Graham to find out anything meaningful — someone who isn’t in the media’s “gotcha” corps.