Republican presidential nominee Donald TrumpDonald John TrumpBiden slams Trump over golf gif hitting Clinton Trump Jr. declines further Secret Service protection: report Report: Mueller warned Manafort to expect an indictment MORE in an interview aired Tuesday touted his temperament while attacking Democratic nominee Hillary ClintonHillary Diane Rodham ClintonBiden slams Trump over golf gif hitting Clinton Overnight Cybersecurity: Equifax hit by earlier hack | What to know about Kaspersky controversy | Officials review EU-US privacy pact Overnight Tech: Equifax hit by earlier undisclosed hack | Facebook takes heat over Russian ads | Alt-right Twitter rival may lose domain MORE for not having a "presidential look."

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"The single greatest asset I have, according to those that know me, is my temperament," Trump told ABC's "Good Morning America."

"But she came up with this ... line: 'Oh, lets talk about his temperament.' It's the single greatest asset I have."

Clinton and her supporters often attack the GOP nominee for his temperament, saying it makes him unfit for the White House.

At a campaign event Monday, Clinton questioned Trump's temperament and said he shouldn't be trusted with nuclear weapons.

“When you see he can’t even go to a foreign country without getting into a public feud with the president, I think it’s clear Donald Trump doesn’t have the temperament to be our commander in chief,” she said, referring to Trump’s ongoing dispute with Mexican President Enrique Peña Nieto over who will pay for Trump’s proposed border wall that’s now playing out on Twitter.

“Imagine him in a real crisis,” Clinton said. “A man you can bait with a tweet should not be trusted with nuclear weapons.”

Trump on ABC also criticized Clinton, saying she doesn't have a "presidential look."

"You need a presidential look," he said in the interview. "You have to get the job done."