Specifically, I'll believe it when I see a Republican who doesn't have a history of regularly tweaking or bashing Trump speaks up. Justin Amash, Jeff Flake, John "Not a War Hero" McCain, or Lindsey "Literally doxxed on national television by Trump" Graham don't count.
Howsabout Richard Burr?
And as for Graham, compare and contrast him to someone like Marco Rubio, who was similarly humiliated on national television (probably in an even worse way than Graham).
And look at the differences in how they have responded. Rubio simply has pathetically confirmed Trump's "Little Marco" caricature.
Graham has acted with a basic level of honor and decency, I would say. That counts for something, even if in other respects (e.g. national security policy) someone like Graham is more dangerous than almost anyone else in the Senate.