It really came down to the assassination of Charlie Kirk (many on the left didn't realise just how important he was to the GOP). Not just politically but emotionally.....he was like a linchpin....like that important person in the family....if a family is lucky enough to have one......who keeps all the relationships inline and connected and the family together.
Kirk was a massive bridge between both wings of the GOP and now that he's gone there's been war between those wings. Kirk was very pro Israel but also critical of the demands of Jewish donors and he refused to cancel his friendships with Carlson and Owens despite threats.
Now he's gone a huge rift has opened up between those who are critical of US policies that they say advantage Israeli interests over American ones and those that regard Israel supporting policies as in America's best interests.
Most of the largest US influencers who aren't Jewish have come out against what they see as an Israeli first foreign policy, so that's Tucker Carlson, Candace Owens and recently Megan Kelly and others. Against them seems to be the Israeli government (funding opposition) Ben Shapiro, Mark Levin and Christian Zionists.
They all pretty much agree on everything else but this one issue but the schism has been so large and the stuff has got so personal that it's probably too wounding to heal.