One thing is definitely going right for U.S. President Donald Trump and his fellow Republicans who control Congress: they are steadily getting conservatives appointed as judges, advancing their long-held ambition of reshaping the federal judiciary.

So concern among conservatives arose after Democrats swept to victory in state and local elections in Virginia, New Jersey and elsewhere this month, signaling potential trouble for Republicans in the November 2018 midterm elections in which control over Congress is at stake.

If the party's slim 52-48 majority in the Senate, which reviews and confirms federal judicial nominees, is at risk, Republicans may need to move even more quickly on getting judges confirmed by the Senate for their lifetime posts, some legal experts said.