The issue is people are afraid of him. There was plenty of Republican opposition to Trump but people either fell in line or got pushed out. (The main problem is that people didn't have the courage to oppose him all at once, he can easily handle one threat at a time.)

I suspect even of Republicans voting in the lines today, they don't like him or his behavior but are too self-interested to do anything about it. When a new administration comes in, between Republicans happy to avoid a Democrat or one of their own have that power again, and Democrats ready to ensure another Trump can never happen again, we'll have bipartisan support for crippling presidential power.