Donald Trump Jr. had a surprising reaction Tuesday to reports that Iran plotted to have his father, former President Trump, assassinated, calling it "maybe the great political endorsement ever."

The eldest Trump son, who is a vocal surrogate for his father's campaign, made the comment in an interview on "Hannity" live from the Republican National Convention in Milwaukee just as the former president arrived donning a visible bandage on his right ear for the second night in a row.

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"I think it’s sort of a great endorsement. When people like Iran want to take you out, that probably means it's good for America, bad for Iran," Trump Jr. said. "That may be the greatest political endorsement ever. But when that happens, their capabilities are much more than a kid with a rifle."

The Department of Homeland Security received intelligence from a human source on an Iranian plot to assassinate former President Trump, Fox News has been told by two federal law enforcement sources. CNN first reported that there has been an increase in Secret Service protection for Trump in recent weeks because of this intelligence. DHS and Secret Service have increasingly been concerned about Trump holding outdoor events, Fox News is told. 

The plot doesn't appear to be connected to Thomas Matthew Crooks, 20, the gunman who shot Trump during his campaign rally in Butler, Pennsylvania, over the weekend, the sources said.  Iran's Permanent Mission to the United Nations denied the allegations, calling them "unsubstantiated and malicious" in a statement to Fox News Digital. Trump directed the January 2020 strike that killed Lt. Gen. Qassem Soleimani, the leader of Iran's Islamic Revolutionary Guard Corps Quds Forces.

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Trump Jr.'s defiant tone Tuesday comes a day after he was seen tearfully welcoming his father to the GOP convention in his first public appearance following the attempt on his life. As former President Trump walked through a packed convention floor roaring with applause, his eldest son became visibly emotional.

"It was allergies," he quipped when Sean Hannity asked how Saturday's assassination attempt against his father affected him personally.

"Not a lot of crying in the Trump family, but that moment, it was so heavy. 48 hours later…just the emotion…but also the love that we felt here," he said. "What I saw over the last couple days here in Milwaukee was just incredible."

Fox News' David Spunt contributed to this report.

Rep. Andy Harris, R-Md., is calling on U.S. Secret Service Director Kimberly Cheatle to resign from her post, following the failed detail that was in place when a man attempted to assassinate former President Trump.

Cheatle acknowledged during an interview with ABC News on Monday that "the Secret Service is responsible for the protection of the former president," adding, "the buck stops with me."

"The responsibility of the Secret Service is to make sure that that venue was safe," Harris told Fox News Digital on Tuesday. "Obviously, this venue was not safe. Obviously, they didn't have adequate communication with the local law enforcement. And the buck does stop with her. She should take full responsibility, and that's why I've asked that she tender her resignation." 

Harris is a member of the House Appropriations Subcommittee on Homeland Security, which is responsible for funding the operations of the Secret Service.

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On Saturday, Thomas Matthew Crooks somehow reached the rooftop of a building in Butler, Pennsylvania, used to stage a tactical team overseeing a presidential rally for Trump.

As Trump spoke to the Pennsylvania crowd, shots rang out from on top of the building, and one of the bullets grazed his right ear.

The Secret Service has since taken strong criticism for allowing the shooter to have a clear line of sight of the president from about 150 yards away.

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Harris said he first heard about the shooting in a text from his wife, and the two of them searched for any news they could, to find out what happened.

Days have passed since the shooting, and Harris said the news he is hearing is "not very flattering" to the law enforcement officials and Secret Service.

Secret Service sources have confirmed that local law enforcement officers were stationed inside the AGR building while Crooks was on the roof. During her interview with ABC News, Cheatle said a decision was made not to put officers on the roof because it was sloped "at its highest point."

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"And so, you know, there's a safety factor that would be considered there, that we wouldn't want to put somebody up on a sloped roof," Cheatle said.

Multiple law enforcement experts have told Fox News that it is ultimately the Secret Service’s decision whether a particular building is put within the security perimeter. The Secret Service also makes the final call on how to protect a building that has a line of sight to a protectee.

"Obviously, the sniper didn't think it was too steep, or the angle was too acute," Harris said. "I think at this point, honestly, I'm disappointed in her response. It sounds like she's making excuses."

Harris also said, "The facts speak for themselves."

"The fact that the president was almost assassinated, you know, in a venue where numerous experts have looked at it and said this should never have happened, means that she should take responsibility," the congressional representative said. "She should resign, even as the investigation goes forward because we have to find a director of the Secret Service… [who would take] her or his role in protecting the former president as well as any other protectee, much more seriously."

Fox News' Jake Gibson and David Spunt contributed to this report.