It was a big issue for last season too, well before Trump became POTUS.  

But I repeat...  None of this would be a problem AT ALL if Kaepernick had not chosen to disrespect the national anthem by refusing to stand the first place, and if many of his cohorts hadn't chosen to do the same. 

Trump poured fuel on the fire, but the fire was started by Kaepernick & Co when they chose disrespect for the national anthem as their vehicle.