Democratic presidential nominee Hillary Clinton on Wednesday accused Republican opponent Donald Trump of inciting violence with his call for gun rights activists to stop her from nominating liberal U.S. Supreme Court justices.

Clinton's comments added to a growing outcry over Trump's remarks on Tuesday at a North Carolina rally, which some interpreted as a call for violence against his White House rival. His remarks also fueled widespread concerns about his ability to stay on track.

"Words matter, my friends," the former U.S. secretary of state said a rally in Des Moines, Iowa. "And if you are running to be president or you are president of the United States, words can have tremendous consequences.