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Donald Trump Jr. said Thursday that unsealed evidence from the preliminary hearing in Charlie Kirk’s murder case puts to rest "conspiracy theories" surrounding his death.

Trump Jr., a longtime friend of Kirk, was in the courtroom in Provo, Utah, this week, hearing arguments and viewing unsealed evidence against Kirk’s accused killer, Tyler Robinson.

"Based on everything that I saw in that courtroom, it's very clear to me that Tyler Robinson did this," he said on "Jesse Watters Primetime."

DONALD TRUMP JR SAYS EVIDENCE IN TYLER ROBINSON PRELIMINARY HEARING 'MORE CUT AND DRY' THAN HE THOUGHT

don jr and tyler robinson

The president's eldest son dismissed "conspiracy theories" surrounding Kirk’s death while saying he understands why people could be skeptical. (Left (FAYEZ NURELDINE/AFP via Getty Images), Right (Rick Egan/The Salt Lake Tribune via Pool))

Robinson, 23, is accused of fatally shooting Kirk, 31, at Utah Valley University on Sept. 10, 2025, and could face the death penalty if convicted.

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His preliminary hearing began Monday, with prosecutors attempting to establish probable cause to allow the case to proceed to trial on a series of charges.

Robinson allegedly admitted to killing Kirk in unsealed text messages to his roommate after the shooting, saying he "had enough of his hatred," according to testimony from Thursday’s hearing.

TYLER ROBINSON'S AND LANCE TWIGGS' DNA BOTH ALLEGEDLY FOUND ON KEY EVIDENCE IN CHARLIE KIRK'S ASSASSINATION

"This stuff is very cut-and-dry at this point," Trump Jr. said.

Composite image shows Tyler Robinson, screenshots of text messages introduced during his preliminary hearing and his former roommate, Lance Twiggs.

A composite image shows Tyler Robinson, center screenshots of text messages prosecutors introduced during his preliminary hearing and his former roommate, Lance Twiggs, who testified about the messages in court. (Rick Egan/The Salt Lake Tribune via Pool ; Pool ; Lance Twiggs/TikTok)

"The DNA evidence, the fact that… he turned himself in… to me, it puts so much of this at rest," he added.

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Trump Jr., a regular speaker at Turning Point USA events, questioned the lack of security presence at Kirk’s Utah Valley University event.

"The biggest question in my mind at this point is not whether Tyler Robinson did this, or if it was some people from a foreign land, or another planet — it was, why were there only six police officers active at a major event on a university campus?" he asked.

ACCUSED CHARLIE KIRK ASSASSIN TYLER ROBINSON FIGHTS BACK AS PROSECUTORS' SPRAWLING CASE COMES INTO FOCUS

Political Activist Charlie Kirk Shot Dead At Utah Valley University

OREM, UTAH - SEPTEMBER 10: Charlie Kirk speaks at Utah Valley University on September 10, 2025 in Orem, Utah. Kirk, founder of Turning Point USA, was speaking at his "American Comeback Tour" when he was shot in the neck and killed. (Photo by Trent Nelson/The Salt Lake Tribune/Getty Images) (Trent Nelson/The Salt Lake Tribune/Getty Images)

Trump Jr. added that TPUSA college campus events usually draw a heavier law enforcement presence, noting they attract "thousands" of people.

"These are big events," he said. "I've done 100 of them with Charlie Kirk on college campuses all over the place... That there wasn't an all-hands-on-deck kind of operation to prevent this very thing from happening is truly scary."

Trump Jr. argued that questions surrounding Kirk’s death had once been a "50–50" issue, but said the unsealed evidence has shifted public sentiment to "90–10," adding that most believe Robinson is guilty.

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He dismissed "conspiracy theories" surrounding Kirk’s death while saying he understands why people could be skeptical.

Prosecutors are expected to present more evidence during Friday’s hearing. A trial date has not been set.