Apparently there was huge huge amount of pressure in the past few months on Charlie Kirk, because even though he was known as being very pro-Israel, he wouldn't stop having people at his events who have been critical of Israel. His most notable anti-Zionist guests were Tucker Carlson and Dave Smith.
In this article Max Blumenthal talks about one specific mega-donor to Charlie Kirk's organization who stopped his donations, and what led to that:
https://thegrayzone.com/2025/09/22/israel-tpusa-donor-terminated-kirk/
The guy that runs The Gray Zone, where the article is posted, seems like he really does his research.
Here's a couple quotes:
Ultra-Zionist billionaire Robert Shillman was one of Charlie Kirk’s most committed donors. But as Kirk fell under attack for his increasingly critical Israel views during his final weeks, sources say Shillman ended funding for TPUSA.
Back at TPUSA, the mounting pressure from Zionist bigwigs left Kirk angry and perturbed in the weeks leading up to his death. The day after the Hamptons summit, he publicly vented about Jewish “stakeholders” seeking to control his message.
(Here's my post on his vent about not being able to talk about Israel)
17 minute interview with Charlie Kirk from about a month ago. Look at his face.
Among the demands Kirk received in his final days was to rescind an invitation to Tucker Carlson, an outspoken critic of Netanyahu, to deliver the keynote address at TPUSA’s upcoming America Fest. Kirk not only resisted the demand, he invited the leading Republican critic of Israel in Congress, Rep. Marjorie Taylor-Greene, to appear at the event as well.
My other posts on the topic of Charlie Kirk's Assassination.