However, there are some in those categories who oppose sending trillions of taxpayer money to Ukraine to fight a proxy war.
I'd like to thank you for providing an example. You just hit on two of the disinformation points the book sets out to debunk: "massive spending" and "proxy war," which are addressed in "Lie #1" and "Lie #2."
At the risk of spoilers, the amount we've spent on Ukraine in two years is less than what we spent in January - April of 2010 alone in Iraq. Also, the notion that it's a "proxy war" implies that the Ukrainians have no agency in the defense of their own borders.
The majority of Republicans (though not the loudest, I'm afraid) have been in favor of sending aid to Ukraine from the beginning, though most of them have said (probably wisely) they want to actually send the weapons themselves rather than sending cash, since it's harder for unscrupulous and shady figures (and Ukraine does have them; they haven't completely managed to clean up the corruption left behind by the last period of Russian rule) to embezzle rockets than cash.