The GOP has the power to stand up to Trump immediately with legislation or with impeachment. The Democrats are already on record as voting for impeachment. Trump has continued to do lots of stuff that is impeachable with lots of evidence. Had the GOP impeached Trump when they had the chance, they would have been rid of him by now.
In addition, with this last election, a bunch of idiotic people sat on their ass going "But they're both the same." or "I don't get into politics." As if their "status quo" status was somehow a virtuous deed instead of a disgusting malfeasance cloaked in laziness.
"It is the common fate of the indolent to see their rights become a prey to the active. The condition upon which God hath given liberty to man is eternal vigilance; which condition if he break, servitude is at once the consequence of his crime and the punishment of his guilt." -- John Philpot Curran, 1790