Donald Trump's presidential campaign strategy appears to be: Open mouth, insert foot.

Trump's latest verbal faux pas comes in an interview with Rolling Stone, in reference to his GOP presidential rival Carly Fiorina.

Watching a televised interview with Fiorina, "Trump's expression sour[ed] in schoolboy disgust," according to the Rolling Stone story, which was published on Wednesday.

"Look at that face!" Trump reportedly remarked. "Would anyone vote for that? Can you imagine that, the face of our next president?!"

Despite being criticized over comments he made about Fox News' Megyn Kelly last month, which some people saw as misogynistic, Trump only dug in further on Fiorina. "I mean, she's a woman, and I'm not s'posedta say bad things, but really, folks, come on. Are we serious?" he wondered aloud, as reported by Rolling Stone.

How to run for president, according to Donald Trump

On Thursday, Trump backpedaled a bit, saying on CNN and during an appearance on The View that he wasn't referring to Fiorina's looks, but instead was commenting on "her persona."

Despite the controversies that have been a staple of his presidential campaign thus far, Trump is currently the GOP frontrunner, with 32 percent of Republican voters saying they support him in a new CNN/ORC poll.