Republican presidential nominee Donald TrumpDonald John TrumpAl Gore: Trump has had 'less of an impact on environment so far than I feared' Trump claims tapes of him saying the 'n-word' don't exist Trump wanted to require staffers to get permission before writing books: report MORE in an interview aired Tuesday touted his temperament while attacking Democratic nominee Hillary ClintonHillary Diane Rodham ClintonHillicon Valley: FBI fires Strzok after anti-Trump tweets | Trump signs defense bill with cyber war policy | Google under scrutiny over location data | Sinclair's troubles may just be beginning | Tech to ease health data access | Netflix CFO to step down Signs grow that Mueller is zeroing in on Roger Stone Omarosa claims president called Trump Jr. a 'f--- up' for releasing Trump Tower emails 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."