They have to. If the middle class tax cuts expire next year, it will be the largest tax hike in history. Even trump will need to keep those tax cuts going. The rich cuts are permanent of course. That was stupid to keep the rich permanent, but put an end date on the working class. No foresight at all.
Republicans made a big mistake by adjusting withholding so that people got more take-home pay instead of letting people get a huge refund at the end of the year. With direct deposit of their paycheck,people who spend everything they earn may not have even realized that they had an increase in take pay. At the end of the year when they did not get their usual refund, they were angry.