Harrisburg, Pennsylvania - Donald Trump is still arguing that he and his running mate JD Vance are not "weird" in a losing battle to counter the one of the more effective Democratic lines of attack.

On Wednesday, Fox News aired the first of a two-part pre-taped town hall event with the Republican presidential candidate.

At one point, moderator Sean Hannity brought up his rival Kamala Harris' running mate, Minnesota Governor Tim Walz, which appeared to trigger Trump, causing him to go off on an angsty rant about his own choice for VP.

"JD is not weird – he's a solid rock! I happen to be a very solid rock!" Trump exclaimed, garnering cheers from the crowd.

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"We're not weird. We are other things, perhaps, but we're not weird," he continued.

"But (Walz) is a weird guy. He walks on the stage and there is something wrong with that guy."

Shortly after, he again went off on a tangent, complaining about a mosquito that appeared to be pestering him on stage.

"I hate mosquitos!" he said, with a scowl. "We don’t like those mosquitoes running around, we want nothing to do with them. And we want nothing to do with bad politicians that hate our country, too."

Walz is credited with first describing Trump and Vance as "weird" on the campaign trail, which immediately became a popular meme.

It's one of the few times an insult has actually managed to stick to Trump, who is clearly bothered by the characterization.

During an interview in early August, Trump argued, "Nobody's ever called me weird; I'm a lot of things, but weird, I'm not."

Only a few days later, he obsessed over it again during an impromptu press conference, saying of Harris: "No, she's weird!"

Trump will finally get the chance to explain to Harris' face how not weird he is when the two have their first presidential debate on Tuesday, September 10.