It is past time for some legitimate Republican to challenge Donald Trump, and attempt to save the Republican party brand.
As much as former Governor William Weld of Massachusetts is attempting such a challenge, he is not strong enough, or well known enough, to have any real chance.
The only legitimate challengers would be the two best in the 2012 and 2016 Presidential sweepstakes—Jon Huntsman, former Utah Governor, Ambassador to China under Barack Obama, and now resigning as Ambassador to Russia under Donald Trump; and former Ohio Governor and long term Congressman John Kasich.
The idea that former South Carolina Governor and former Congressman Mark Sanford might run is not a realistic or worthwhile endeavor, as Sanford had a sex scandal a decade ago that forced him out of the Governorship, and he is no model for Presidential leadership skills and ability, which at least William Weld does have.
Huntsman or Kasich would be a realistic alternative for conservatives who are appalled by Donald Trump in every way possible!