Republican presidential hopeful Jeb Bush is going after Donald Trump in a new online video, which features a South Carolina diner owner who claims the GOP front-runner has shown a lack of sensitivity toward disabled Americans.

Tim Dyar's 12-year-old son, Breylen, suffers from cerebral palsy, one of the most common congenital disorders among children. Dyar said he wanted to "make sure" that Trump does not become the Republican nominee because the real estate tycoon last year allegedly mocked a New York Times reporter's physical disability, the Business Insider reported.

"It's just not right; it's not presidential," Dyar notes in the video, titled "Taking a Stand." During the November incident, Trump performed what Politico has called a "derisive impression" of journalist Serge Kovaleski, who suffers from a chronic condition that has limited the movement of his arms.

"I have a 12-year-old son who's handicapped," Dyar says in the spot. "He has cerebral palsy and that just made me so angry. I told my wife I just couldn't let that stand. I had to do something to make sure Donald Trump wasn't the nominee."

As could be expected from a campaign commercial, meanwhile, the spot also includes ample praise for the former Florida governor's White House bid.

"Jeb -- it comes across that he's a caring man. He is sincere. Many people said he's the steady hand, and that's somebody we need in the White House," Dyar insists. "The biggest thing that you see right away is that Jeb has actual ideas. I mean, he has a plan. If you ask him about ISIS, he has a plan. Our country is looking for leadership, and he's that leadership that we need."

Meanwhile, the real estate tycoon on Jan. 9 slammed the Floridian's TV recent ad buys, The Hill noted.

"$69 million," Trump exclaimed in apparent reference to the figure Bush has spent on commercials promoting his White House bid.

"It shows you, you can't buy elections anymore. It's really true. I think people are too smart for it," the former "Apprentice" star added.