Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE in an interview that aired Thursday defended the insults he's made on Twitter throughout his presidential campaign.

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"It's OK, most of them deserved it," Trump said on ABC's "Good Morning America."

"I believe in fighting back when people are against me, when they tell lies, you know, I have the power of this instrument and, frankly, sometimes I'll use that. And I agree sometimes it will revert back or sometimes maybe it doesn't come out — you have to be careful with it."

The GOP nominee often uses Twitter to take shots at his political rivals or those who have offended him.

The New York Times earlier this week published a two-page list of all of the insults the GOP nominee has made on Twitter. The list included all the "people, places and things Donald Trump has insulted on Twitter since declaring his candidacy for president," according to the Times.

During "Good Morning America," Melania Trump said she would focus on social media as first lady.

"What's going on is very hurtful to children, to some adults as well," Melania Trump said.

"We need to teach [children] how to use it, what is right to say, what is not right to say, because it is very bad out there, and children get hurt."

The GOP nominee agreed that so many people are "hurt" by social media.

"She feels very strongly about. She understands it very well," Donald Trump said.