It's really just republicans are only unified in presenting a unified front so when it comes to actually doing something like electing a speaker [2] [3] the lack of alignment becomes obvious. So they aren't doing anything to counteract trump because they aren't as a whole unified in that it's something they want but they're unified in not fracturing and helping democrats.
[1]: https://en.wikipedia.org/wiki/United_States_Congress
[2]: https://en.wikipedia.org/wiki/January_2023_Speaker_of_the_Un...
[3]: https://en.wikipedia.org/wiki/October_2023_Speaker_of_the_Un...