Republican presidential front-runner Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE on Sunday defended his comments that a man who tried to rush the stage during a rally on Saturday had ties to ISIS, saying all he knew about it came from what he saw on the Internet.

"Now, I don't know. What do I know about it? All I know is what's on the Internet," Trump said on NBC's "Meet the Press" on Sunday.

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Trump tweeted on Saturday that the "USSS did an excellent job stopping the maniac running to the stage. He has ties to ISIS. Should be in jail!"

USSS did an excellent job stopping the maniac running to the stage. He has ties to ISIS. Should be in jail! https://t.co/tkzbHg7wyD?ssr=true — Donald J. Trump (@realDonaldTrump) March 12, 2016

Trump said on Sunday that he shared the video of the man who attempted to rush the stage "dragging the American flag on the ground."

"He was playing Arabic music; he was dragging the flag along the ground; and he had Internet chatter with ISIS and about ISIS," Trump said.

"So I don't know if he was or not. But all we did was put out what he had on his Internet. He's dragging the flag, the American flag, which I respect."

Host Chuck Todd said on Sunday that the video "turned out to be a hoax" and asked Trump if he went over the top with his accusation.

"Somebody made that up," Todd said.

But Trump defended himself, saying the man in the video looked like the same man who had rushed the stage during the rally.

"He was dragging the American flag on the ground like it was a piece of garbage, OK? I don't like that," he said.

"I don't like to see a man dragging the American flag along the ground in a mocking fashion."