Republican presidential nominee Donald TrumpDonald John TrumpDems flip Wisconsin state Senate seat Sessions: 'We should be like Canada' in how we take in immigrants GOP rep: 'Sheet metal and garbage' everywhere in Haiti MORE in an interview aired Tuesday touted his temperament while attacking Democratic nominee Hillary ClintonHillary Diane Rodham ClintonIntel Dem decries White House 'gag order' after Bannon testimony 'Total free-for-all' as Bannon clashes with Intel members Mellman: On Political Authenticity (Part 2) 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."