Pennsylvania Senate candidate Lou Barletta (R) called his Democratic opponent's latest campaign ad "evil" for taking a swipe at his cancer-stricken grandson.

The ad for incumbent Sen. Bob Casey features a mother telling the story of her twin daughters' cancer diagnosis, and being thankful for having health insurance.

"But if Lou Barletta has his way, kids like could be denied the care they need," she continued.

A month ago, Barletta said he privately told Casey that his 18-month-old grandson - also a twin - is currently undergoing chemotherapy treatment.

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Barletta said on Fox & Friends that he didn't think anyone could stoop to the "all-time low" treatment seen with Supreme Court Justice Brett Kavanaugh.

"To see this commercial is evil," Barletta said on Tuesday. "That's the only way I could describe it. It's evil."

He called the ad "a lie" and added he wouldn't support anything that would deny health coverage to those with pre-existing conditions.

Barletta said that Casey's ad shows how "desperate" he is.

"You wouldn't do this unless you felt that you had to, to hurt a family for political purposes," Barletta said. "It's just wrong."

The ad was pulled from Barletta's home market of Scranton by Casey's campaign on Monday, but will air in the rest of Pennsylvania's markets.

In a statement, Casey said that the parallel to Barletta's personal situation was unintentional, according to CBS 2 Pittsburgh.

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