Members of the House, along with Senators, who are Democrats, are doing precisely what the voters elected them to do. Democrat voters WANT all the political points they can get to help destroy Trump and all who voted for him. They also want the government to keep doing what it was doing under the previous administration, and that can only happen when the present administration is stymied by circuses such as the Supreme Court hearings and the Mueller report investigations.
That is NOT what the voters elected them to do.