Nobody is changing their vote to Trump for House Speaker. When Trump was nominated, he only garnered one vote by Matt Gaetz. The end.
You’re missing something.
Trump has been endorsing McCarthy because McCarthy has been begging for his endorsement.
All House GOP Members were not aware Trump would even think to serve as Speaker. Gaetz voted Trump as a protest to McCarthy.
So now yes, there will be a few that join Gaetz because quite a few can’t stand McCarthy.